diff --git a/application/Espo/Classes/Cleanup/TwoFactorCodes.php b/application/Espo/Classes/Cleanup/TwoFactorCodes.php
new file mode 100644
index 0000000000..1d627ce0c9
--- /dev/null
+++ b/application/Espo/Classes/Cleanup/TwoFactorCodes.php
@@ -0,0 +1,77 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Classes\Cleanup;
+
+use Espo\Core\Cleanup\Cleanup;
+use Espo\Core\Utils\Config;
+use Espo\Core\Utils\DateTime as DateTimeUtil;
+
+use Espo\ORM\EntityManager;
+
+use Espo\Entities\TwoFactorCode;
+
+use DateTime;
+
+class TwoFactorCodes implements Cleanup
+{
+    private const PERIOD = '5 days';
+
+    private $config;
+
+    private $entityManager;
+
+    public function __construct(Config $config, EntityManager $entityManager)
+    {
+        $this->config = $config;
+        $this->entityManager = $entityManager;
+    }
+
+    public function process(): void
+    {
+        $period = '-' . $this->config->get('cleanupTwoFactorCodesPeriod', self::PERIOD);
+
+        $from = (new DateTime())
+            ->modify($period)
+            ->format(DateTimeUtil::SYSTEM_DATE_TIME_FORMAT);
+
+        $query = $this->entityManager
+            ->getQueryBuilder()
+            ->delete()
+            ->from(TwoFactorCode::ENTITY_TYPE)
+            ->where([
+                'createdAt<' => $from,
+            ])
+            ->build();
+
+        $this->entityManager
+            ->getQueryExecutor()
+            ->execute($query);
+    }
+}
diff --git a/application/Espo/Controllers/TwoFactorEmail.php b/application/Espo/Controllers/TwoFactorEmail.php
new file mode 100644
index 0000000000..fd675a8431
--- /dev/null
+++ b/application/Espo/Controllers/TwoFactorEmail.php
@@ -0,0 +1,80 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Controllers;
+
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Core\Exceptions\BadRequest;
+
+use Espo\Core\Api\Request;
+
+use Espo\Services\TwoFactorEmail as Service;
+
+use Espo\Entities\User;
+
+class TwoFactorEmail
+{
+    private $service;
+
+    public function __construct(Service $service, User $user)
+    {
+        $this->service = $service;
+        $this->user = $user;
+
+        if (
+            !$this->user->isAdmin() &&
+            !$this->user->isRegular()
+        ) {
+            throw new Forbidden();
+        }
+    }
+    public function postActionSendCode(Request $request): bool
+    {
+        $data = $request->getParsedBody();
+
+        $id = $data->id ?? null;
+        $emailAddress = $data->emailAddress ?? null;
+
+        if (!$id) {
+            throw new BadRequest("No 'id'.");
+        }
+
+        if (!$emailAddress) {
+            throw new BadRequest("No 'emailAddress'.");
+        }
+
+        if (!$this->user->isAdmin() && $id !== $this->user->getId()) {
+            throw new Forbidden();
+        }
+
+        $this->service->sendCode($id, $emailAddress);
+
+        return true;
+    }
+}
diff --git a/application/Espo/Core/Authentication/TwoFactor/Email/EmailLogin.php b/application/Espo/Core/Authentication/TwoFactor/Email/EmailLogin.php
new file mode 100644
index 0000000000..d366ab2c07
--- /dev/null
+++ b/application/Espo/Core/Authentication/TwoFactor/Email/EmailLogin.php
@@ -0,0 +1,105 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Authentication\TwoFactor\Email;
+
+use Espo\ORM\EntityManager;
+
+use Espo\Entities\User;
+use Espo\Entities\UserData;
+
+use Espo\Repositories\UserData as UserDataRepository;
+
+use Espo\Core\Authentication\TwoFactor\Login;
+use Espo\Core\Authentication\Result;
+use Espo\Core\Authentication\ResultData;
+use Espo\Core\Authentication\FailReason;
+
+use Espo\Core\Api\Request;
+
+class EmailLogin implements Login
+{
+    private $entityManager;
+
+    private $util;
+
+    public function __construct(EntityManager $entityManager, Util $util)
+    {
+        $this->entityManager = $entityManager;
+        $this->util = $util;
+    }
+
+    public function login(Result $result, Request $request): Result
+    {
+        $code = $request->getHeader('Espo-Authorization-Code');
+
+        if (!$code) {
+            $this->util->sendCode($result->getLoggedUser());
+
+            return Result::secondStepRequired($result->getUser(), $this->getLoginData());
+        }
+
+        $loggedUser = $result->getLoggedUser();
+
+        if ($this->verifyCode($loggedUser, $code)) {
+            return $result;
+        }
+
+        return Result::fail(FailReason::CODE_NOT_VERIFIED);
+    }
+
+    private function getLoginData(): ResultData
+    {
+        return ResultData::createWithMessage('enterCodeSentInEmail');
+    }
+
+    private function verifyCode(User $user, string $code): bool
+    {
+        $userData = $this->getUserDataRepository()->getByUserId($user->getId());
+
+        if (!$userData) {
+            return false;
+        }
+
+        if (!$userData->get('auth2FA')) {
+            return false;
+        }
+
+        if ($userData->get('auth2FAMethod') !== 'Email') {
+            return false;
+        }
+
+        return $this->util->verifyCode($user, $code);
+    }
+
+    private function getUserDataRepository(): UserDataRepository
+    {
+        return $this->entityManager->getRepository(UserData::ENTITY_TYPE);
+    }
+}
diff --git a/application/Espo/Core/Authentication/TwoFactor/Email/EmailUserSetup.php b/application/Espo/Core/Authentication/TwoFactor/Email/EmailUserSetup.php
new file mode 100644
index 0000000000..99f62548a6
--- /dev/null
+++ b/application/Espo/Core/Authentication/TwoFactor/Email/EmailUserSetup.php
@@ -0,0 +1,72 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Authentication\TwoFactor\Email;
+
+use Espo\Entities\User;
+
+use Espo\Core\Authentication\TwoFactor\UserSetup;
+
+use Espo\Core\Exceptions\Error;
+
+use stdClass;
+
+class EmailUserSetup implements UserSetup
+{
+    private $util;
+
+    public function __construct(Util $util)
+    {
+        $this->util = $util;
+    }
+
+    public function getData(User $user): stdClass
+    {
+        return (object) [
+            'emailAddressList' => $user->getEmailAddressGroup()->getAddressList(),
+        ];
+    }
+
+    public function verifyData(User $user, stdClass $payloadData): bool
+    {
+        $code = $payloadData->code ?? null;
+
+        if ($code === null) {
+            throw new Error("No code.");
+        }
+
+        $codeModified = str_replace(' ', '', trim($code));
+
+        if (!$codeModified) {
+            return false;
+        }
+
+        return $this->util->verifyCode($user, $codeModified);
+    }
+}
diff --git a/application/Espo/Core/Authentication/TwoFactor/Email/Util.php b/application/Espo/Core/Authentication/TwoFactor/Email/Util.php
new file mode 100644
index 0000000000..351567d05c
--- /dev/null
+++ b/application/Espo/Core/Authentication/TwoFactor/Email/Util.php
@@ -0,0 +1,340 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Authentication\TwoFactor\Email;
+
+use Espo\Core\Exceptions\Error;
+use Espo\Core\Exceptions\Forbidden;
+
+use Espo\Core\Utils\Config;
+use Espo\Core\Mail\EmailSender;
+use Espo\Core\Mail\EmailFactory;
+use Espo\Core\Utils\TemplateFileManager;
+use Espo\Core\Htmlizer\HtmlizerFactory;
+use Espo\Core\Field\DateTime;
+
+use Espo\ORM\EntityManager;
+use Espo\ORM\Query\Part\Condition as Cond;
+
+use Espo\Entities\User;
+use Espo\Entities\Email;
+use Espo\Entities\TwoFactorCode;
+use Espo\Entities\UserData;
+
+use Espo\Repositories\UserData as UserDataRepository;
+
+use const STR_PAD_LEFT;
+
+class Util
+{
+    /**
+     * A lifetime of a code.
+     */
+    private const CODE_LIFETIME_PERIOD = '10 minutes';
+
+    /*
+     * A max number of attempts to try a single code.
+     */
+    private const CODE_ATTEMPTS_COUNT = 5;
+
+    /**
+     * A length of a code.
+     */
+    private const CODE_LENGTH = 7;
+
+    /**
+     * A max number of codes tried by a user in a period defined by `CODE_LIMIT_PERIOD`.
+     */
+    private const CODE_LIMIT = 5;
+
+    /**
+     * A period for limiting trying to too many codes.
+     */
+    private const CODE_LIMIT_PERIOD = '10 minutes';
+
+    private $entityManager;
+
+    private $config;
+
+    private $emailSender;
+
+    private $templateFileManager;
+
+    private $htmlizerFactory;
+
+    private $emailFactory;
+
+    public function __construct(
+        EntityManager $entityManager,
+        Config $config,
+        EmailSender $emailSender,
+        TemplateFileManager $templateFileManager,
+        HtmlizerFactory $htmlizerFactory,
+        EmailFactory $emailFactory
+    ) {
+        $this->entityManager = $entityManager;
+        $this->config = $config;
+        $this->emailSender = $emailSender;
+        $this->templateFileManager = $templateFileManager;
+        $this->htmlizerFactory = $htmlizerFactory;
+        $this->emailFactory = $emailFactory;
+    }
+
+    public function storeEmailAddress(User $user, string $emailAddress): void
+    {
+        $this->checkEmailAddressIsUsers($user, $emailAddress);
+
+        $userData = $this->getUserDataRepository()->getByUserId($user->getId());
+
+        $userData->set('auth2FAEmailAddress', $emailAddress);
+
+        $this->entityManager->saveEntity($userData);
+    }
+
+    public function verifyCode(User $user, string $code): bool
+    {
+        $codeEntity = $this->findCodeEntity($user);
+
+        if (!$codeEntity) {
+            return false;
+        }
+
+        if ($codeEntity->getAttemptsLeft() <= 1) {
+            $this->decrementAttemptsLeft($codeEntity);
+            $this->inactivateExistingCodeRecords($user);
+
+            return false;
+        }
+
+        if ($codeEntity->getCode() !== $code) {
+            $this->decrementAttemptsLeft($codeEntity);
+
+            return false;
+        }
+
+        if (!$this->isCodeValidByLifetime($codeEntity)) {
+            $this->inactivateExistingCodeRecords($user);
+
+            return false;
+        }
+
+        $this->inactivateExistingCodeRecords($user);
+
+        return true;
+    }
+
+    public function sendCode(User $user, ?string $emailAddress = null): void
+    {
+        if ($emailAddress === null) {
+            $emailAddress = $this->getEmailAddress($user);
+        }
+
+        $this->checkEmailAddressIsUsers($user, $emailAddress);
+        $this->checkCodeLimit($user);
+
+        $code = $this->generateCode();
+
+        $this->inactivateExistingCodeRecords($user);
+        $this->createCodeRecord($user, $code);
+
+        $email = $this->createEmail($user, $code, $emailAddress);
+
+        $this->emailSender->send($email);
+    }
+
+    private function isCodeValidByLifetime(TwoFactorCode $codeEntity): bool
+    {
+        $period = $this->config->get('auth2FAEmailCodeLifetimePeriod') ?? self::CODE_LIFETIME_PERIOD;
+
+        $validUntil = $codeEntity->getCreatedAt()->modify($period);
+
+        if (DateTime::createNow()->diff($validUntil)->invert) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private function findCodeEntity(User $user): ?TwoFactorCode
+    {
+        return $this->entityManager
+            ->getRDBRepository(TwoFactorCode::ENTITY_TYPE)
+            ->where([
+                'method' => 'Email',
+                'userId' => $user->getId(),
+                'isActive' => true,
+            ])
+            ->findOne();
+    }
+
+    private function getEmailAddress(User $user): string
+    {
+        $userData = $this->getUserDataRepository()->getByUserId($user->getId());
+
+        if (!$userData) {
+            throw new Error("UserData not found.");
+        }
+
+        $emailAddress = $userData->get('auth2FAEmailAddress');
+
+        if ($emailAddress) {
+            return $emailAddress;
+        }
+
+        if ($user->getEmailAddressGroup()->getCount() === 0) {
+            throw new Error("User does not have email address.");
+        }
+
+        return $user->getEmailAddressGroup()->getPrimary()->getAddress();
+    }
+
+    private function checkEmailAddressIsUsers(User $user, string $emailAddress): void
+    {
+        $userAddressList = array_map(
+            function (string $item) {
+                return strtolower($item);
+            },
+            $user->getEmailAddressGroup()->getAddressList()
+        );
+
+        if (!in_array(strtolower($emailAddress), $userAddressList)) {
+            throw new Forbidden("Email address is not one of user's.");
+        }
+    }
+
+    private function checkCodeLimit(User $user): void
+    {
+        $limit = $this->config->get('auth2FAEmailCodeLimit') ?? self::CODE_LIMIT;
+        $period = $this->config->get('auth2FAEmailCodeLimitPeriod') ?? self::CODE_LIMIT_PERIOD;
+
+        $from = DateTime::createNow()
+            ->modify('-' . $period)
+            ->getString();
+
+        $count = $this->entityManager
+            ->getRDBRepository(TwoFactorCode::ENTITY_TYPE)
+            ->where(
+                Cond::and(
+                    Cond::equal(Cond::column('method'), 'Email'),
+                    Cond::equal(Cond::column('userId'), $user->getId()),
+                    Cond::greaterOrEqual(Cond::column('createdAt'), $from),
+                    Cond::lessOrEqual(Cond::column('attemptsLeft'), 0),
+                )
+            )
+            ->count();
+
+        if ($count >= $limit) {
+            throw new Forbidden("Max code count exceeded.");
+        }
+    }
+
+    private function generateCode(): string
+    {
+        $codeLength = $this->config->get('auth2FAEmailCodeLength') ?? self::CODE_LENGTH;
+
+        $max = pow(10, $codeLength) - 1;
+
+        return str_pad(
+            (string) random_int(0, $max),
+            $codeLength,
+            '0',
+            STR_PAD_LEFT
+        );
+    }
+
+    private function createEmail(User $user, string $code, string $emailAddress): Email
+    {
+        $subjectTpl = $this->templateFileManager->getTemplate('twoFactorCode', 'subject');
+        $bodyTpl = $this->templateFileManager->getTemplate('twoFactorCode', 'body');
+
+        $htmlizer = $this->htmlizerFactory->create();
+
+        $data = [
+            'code' => $code,
+        ];
+
+        $subject = $htmlizer->render($user, $subjectTpl, null, $data, true);
+        $body = $htmlizer->render($user, $bodyTpl, null, $data, true);
+
+        $email = $this->emailFactory->create();
+
+        $email->setSubject($subject);
+        $email->setBody($body);
+        $email->addToAddress($emailAddress);
+
+        return $email;
+    }
+
+    private function inactivateExistingCodeRecords(User $user): void
+    {
+        $query = $this->entityManager
+            ->getQueryBuilder()
+            ->update()
+            ->in(TwoFactorCode::ENTITY_TYPE)
+            ->where([
+                'userId' => $user->getId(),
+                'method' => 'Email',
+            ])
+            ->set([
+                'isActive' => false,
+            ])
+            ->build();
+
+        $this->entityManager
+            ->getQueryExecutor()
+            ->execute($query);
+    }
+
+    private function createCodeRecord(User $user, string $code): void
+    {
+        $this->entityManager->createEntity(TwoFactorCode::ENTITY_TYPE, [
+            'code' => $code,
+            'userId' => $user->getId(),
+            'method' => 'Email',
+            'attemptsLeft' => $this->getCodeAttemptsCount(),
+        ]);
+    }
+
+    private function getUserDataRepository(): UserDataRepository
+    {
+        return $this->entityManager->getRepository(UserData::ENTITY_TYPE);
+    }
+
+    private function decrementAttemptsLeft(TwoFactorCode $codeEntity): void
+    {
+        $codeEntity->decrementAttemptsLeft();
+
+        $this->entityManager->saveEntity($codeEntity);
+    }
+
+    private function getCodeAttemptsCount(): int
+    {
+        return $this->config->get('auth2FAEmailCodeAttemptsCount') ?? self::CODE_ATTEMPTS_COUNT;
+    }
+}
diff --git a/application/Espo/Entities/TwoFactorCode.php b/application/Espo/Entities/TwoFactorCode.php
new file mode 100644
index 0000000000..8459b39dd8
--- /dev/null
+++ b/application/Espo/Entities/TwoFactorCode.php
@@ -0,0 +1,67 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Entities;
+
+use Espo\Core\Field\DateTime;
+
+class TwoFactorCode extends \Espo\Core\ORM\Entity
+{
+    public const ENTITY_TYPE = 'TwoFactorCode';
+
+    public function isActive(): bool
+    {
+        return $this->get('isActive');
+    }
+
+    public function getCreatedAt(): DateTime
+    {
+        return $this->getValueObject('createdAt');
+    }
+
+    public function getCode(): string
+    {
+        return $this->get('code');
+    }
+
+    public function getAttemptsLeft(): int
+    {
+        return $this->get('attemptsLeft');
+    }
+
+    public function setInactive(): void
+    {
+        $this->set('isActive', false);
+    }
+
+    public function decrementAttemptsLeft(): void
+    {
+        $this->set('attemptsLeft', $this->getAttemptsLeft() - 1);
+    }
+}
diff --git a/application/Espo/Resources/i18n/en_US/Admin.json b/application/Espo/Resources/i18n/en_US/Admin.json
index 54f8fdb1c7..a2efbcec90 100644
--- a/application/Espo/Resources/i18n/en_US/Admin.json
+++ b/application/Espo/Resources/i18n/en_US/Admin.json
@@ -317,6 +317,7 @@
         "readable": "Readable"
     },
     "templates": {
+        "twoFactorCode": "2FA Code",
         "accessInfo": "Access Info",
         "accessInfoPortal": "Access Info for Portals",
         "assignment": "Assignment",
diff --git a/application/Espo/Resources/i18n/en_US/Settings.json b/application/Espo/Resources/i18n/en_US/Settings.json
index 93258183ca..fa652ed41a 100644
--- a/application/Espo/Resources/i18n/en_US/Settings.json
+++ b/application/Espo/Resources/i18n/en_US/Settings.json
@@ -154,7 +154,8 @@
             "EmailReceived": "Received emails"
         },
         "auth2FAMethodList": {
-            "Totp": "TOTP"
+            "Totp": "TOTP",
+            "Email": "Email"
         }
     },
     "tooltips": {
diff --git a/application/Espo/Resources/i18n/en_US/User.json b/application/Espo/Resources/i18n/en_US/User.json
index 11a88296a2..e43cdf74b0 100644
--- a/application/Espo/Resources/i18n/en_US/User.json
+++ b/application/Espo/Resources/i18n/en_US/User.json
@@ -77,7 +77,8 @@
         "Security": "Security",
         "Reset 2FA": "Reset 2FA",
         "Code": "Code",
-        "Secret": "Secret"
+        "Secret": "Secret",
+        "Send Code": "Send Code"
     },
     "tooltips": {
         "defaultTeam": "All records created by this user will be related to this team by default.",
@@ -108,6 +109,8 @@
         "userNameExists": "User Name already exists",
         "wrongCode": "Wrong code",
         "codeIsRequired": "Code is required",
+        "choose2FaEmailAddress": "Select an email address that will be used for 2FA. It's highly recommended to use a non-primary email address.",
+        "enterCodeSentInEmail": "Enter the code sent to your email address.",
         "enterTotpCode": "Enter a code from your authenticator app.",
         "verifyTotpCode": "Scan the QR-code with your mobile authenticator app. If you have a trouble with scanning, you can enter the secret manually. After that you will see a 6-digit code in your application. Enter this code in the field below.",
         "generateAndSendNewPassword": "A new password will be generated and sent to the user's email address.",
diff --git a/application/Espo/Resources/metadata/app/authentication2FAMethods.json b/application/Espo/Resources/metadata/app/authentication2FAMethods.json
index d25df8b2fa..328293de1a 100644
--- a/application/Espo/Resources/metadata/app/authentication2FAMethods.json
+++ b/application/Espo/Resources/metadata/app/authentication2FAMethods.json
@@ -6,5 +6,13 @@
         "userApplyView": "views/user-security/modals/totp",
         "loginClassName": "Espo\\Core\\Authentication\\TwoFactor\\Totp\\TotpLogin",
         "userSetupClassName": "Espo\\Core\\Authentication\\TwoFactor\\Totp\\TotpUserSetup"
+    },
+    "Email": {
+        "settings": {
+            "isAvailable": true
+        },
+        "userApplyView": "views/user-security/modals/two-factor-email",
+        "loginClassName": "Espo\\Core\\Authentication\\TwoFactor\\Email\\EmailLogin",
+        "userSetupClassName": "Espo\\Core\\Authentication\\TwoFactor\\Email\\EmailUserSetup"
     }
 }
diff --git a/application/Espo/Resources/metadata/app/cleanup.json b/application/Espo/Resources/metadata/app/cleanup.json
index 09db587b02..e031a00925 100644
--- a/application/Espo/Resources/metadata/app/cleanup.json
+++ b/application/Espo/Resources/metadata/app/cleanup.json
@@ -6,5 +6,8 @@
     "webhookQueue": {
         "className": "Espo\\Classes\\Cleanup\\WebhookQueue",
         "order": 11
+    },
+    "twoFactorCodes": {
+        "className": "Espo\\Classes\\Cleanup\\TwoFactorCodes"
     }
 }
diff --git a/application/Espo/Resources/metadata/app/templates.json b/application/Espo/Resources/metadata/app/templates.json
index a9ae5eea3c..930adb5ff5 100644
--- a/application/Espo/Resources/metadata/app/templates.json
+++ b/application/Espo/Resources/metadata/app/templates.json
@@ -25,5 +25,8 @@
     },
     "passwordChangeLink": {
         "scope": "User"
+    },
+    "twoFactorCode": {
+        "scope": "User"
     }
 }
diff --git a/application/Espo/Resources/metadata/entityDefs/TwoFactorCode.json b/application/Espo/Resources/metadata/entityDefs/TwoFactorCode.json
new file mode 100644
index 0000000000..c5158331d0
--- /dev/null
+++ b/application/Espo/Resources/metadata/entityDefs/TwoFactorCode.json
@@ -0,0 +1,56 @@
+{
+    "fields": {
+        "code": {
+            "type": "varchar",
+            "maxLength": 100
+        },
+        "method": {
+            "type": "varchar",
+            "maxLength": 100
+        },
+        "attemptsLeft": {
+            "type": "int"
+        },
+        "isActive": {
+            "type": "bool",
+            "default": true
+        },
+        "createdAt": {
+            "type": "datetime",
+            "readOnly": true
+        }
+    },
+    "links": {
+        "user": {
+            "type": "belongsTo",
+            "entity": "User"
+        }
+    },
+    "indexes": {
+        "createdAt": {
+            "columns": [
+                "createdAt"
+            ]
+        },
+        "userIdMethod": {
+            "columns": [
+                "userId",
+                "method"
+            ]
+        },
+        "userIdMethodIsActive": {
+            "columns": [
+                "userId",
+                "method",
+                "isActive"
+            ]
+        },
+        "userIdMethodCreatedAt": {
+            "columns": [
+                "userId",
+                "method",
+                "createdAt"
+            ]
+        }
+    }
+}
diff --git a/application/Espo/Resources/metadata/entityDefs/UserData.json b/application/Espo/Resources/metadata/entityDefs/UserData.json
index 1942b994eb..7a4cc0d368 100644
--- a/application/Espo/Resources/metadata/entityDefs/UserData.json
+++ b/application/Espo/Resources/metadata/entityDefs/UserData.json
@@ -15,6 +15,9 @@
         "auth2FATotpSecret": {
             "type": "varchar",
             "maxLength": 32
+        },
+        "auth2FAEmailAddress": {
+            "type": "varchar"
         }
     },
     "links": {
diff --git a/application/Espo/Resources/templates/twoFactorCode/en_US/body.tpl b/application/Espo/Resources/templates/twoFactorCode/en_US/body.tpl
new file mode 100644
index 0000000000..f37be9a078
--- /dev/null
+++ b/application/Espo/Resources/templates/twoFactorCode/en_US/body.tpl
@@ -0,0 +1,3 @@
+<p>Enter this code to log in to EspoCRM.</p>
+
+<p>Code: <strong>{{code}}</strong></p>
diff --git a/application/Espo/Resources/templates/twoFactorCode/en_US/subject.tpl b/application/Espo/Resources/templates/twoFactorCode/en_US/subject.tpl
new file mode 100644
index 0000000000..ab3fa58556
--- /dev/null
+++ b/application/Espo/Resources/templates/twoFactorCode/en_US/subject.tpl
@@ -0,0 +1 @@
+EspoCRM authentication code
\ No newline at end of file
diff --git a/application/Espo/Services/TwoFactorEmail.php b/application/Espo/Services/TwoFactorEmail.php
new file mode 100644
index 0000000000..b8f10dfe16
--- /dev/null
+++ b/application/Espo/Services/TwoFactorEmail.php
@@ -0,0 +1,71 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Services;
+
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Core\Exceptions\NotFound;
+
+use Espo\Core\Authentication\TwoFactor\Email\Util;
+
+use Espo\ORM\EntityManager;
+
+use Espo\Entities\User;
+
+class TwoFactorEmail
+{
+    private $util;
+
+    private $user;
+
+    private $entityManager;
+
+    public function __construct(Util $util, User $user, EntityManager $entityManager)
+    {
+        $this->util = $util;
+        $this->user = $user;
+        $this->entityManager = $entityManager;
+    }
+
+    public function sendCode(string $userId, string $emailAddress): void
+    {
+        if (!$this->user->isAdmin() && $userId !== $this->user->getId()) {
+            throw new Forbidden();
+        }
+
+        $user = $this->entityManager->getEntity(User::ENTITY_TYPE, $userId);
+
+        if (!$user) {
+            throw new NotFound();
+        }
+
+        $this->util->sendCode($user, $emailAddress);
+        $this->util->storeEmailAddress($user, $emailAddress);
+    }
+}
diff --git a/client/res/templates/user-security/modals/two-factor-email.tpl b/client/res/templates/user-security/modals/two-factor-email.tpl
new file mode 100644
index 0000000000..15a6f8c17e
--- /dev/null
+++ b/client/res/templates/user-security/modals/two-factor-email.tpl
@@ -0,0 +1,15 @@
+<div class="panel no-side-margin">
+    <div class="panel-body">
+        <p class="p-info">
+            {{translate 'choose2FaEmailAddress' category='messages' scope='User'}}
+        </p>
+        <p class="p-button">
+            <button class="btn btn-default" data-action="sendCode">{{translate 'Send Code' scope='User'}}</button>
+        </p>
+        <p class="p-info-after hidden">
+            {{translate 'enterCodeSentInEmail' category='messages' scope='User'}}
+        </p>
+    </div>
+</div>
+
+<div class="record">{{{record}}}</div>
diff --git a/client/src/views/user-security/modals/two-factor-email.js b/client/src/views/user-security/modals/two-factor-email.js
new file mode 100644
index 0000000000..30153877a8
--- /dev/null
+++ b/client/src/views/user-security/modals/two-factor-email.js
@@ -0,0 +1,192 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+define('views/user-security/modals/two-factor-email',
+    ['views/modal', 'model'],
+    function (Dep, Model) {
+
+    return Dep.extend({
+
+        template: 'user-security/modals/two-factor-email',
+
+        className: 'dialog dialog-record',
+
+        events: {
+            'click [data-action="sendCode"]': function () {
+                this.actionSendCode();
+            },
+        },
+
+        setup: function () {
+            this.buttonList = [
+                {
+                    name: 'apply',
+                    label: 'Apply',
+                    style: 'danger',
+                    hidden: true,
+                },
+                {
+                    name: 'cancel',
+                    label: 'Cancel',
+                }
+            ];
+
+            this.headerHtml = false;
+
+            let codeLength = this.getConfig().get('auth2FAEmailCodeLength') || 7;
+
+            let model = new Model();
+
+            model.name = 'UserSecurity';
+
+            model.set('emailAddress', null);
+
+            model.setDefs({
+                fields: {
+                    'code': {
+                        type: 'varchar',
+                        required: true,
+                        maxLength: codeLength,
+                    },
+                    'emailAddress': {
+                        type: 'enum',
+                        required: true,
+                    },
+                }
+            });
+
+            this.internalModel = model;
+
+            this.wait(
+                Espo.Ajax
+                    .postRequest('UserSecurity/action/getTwoFactorUserSetupData', {
+                        id: this.model.id,
+                        password: this.model.get('password'),
+                        auth2FAMethod: this.model.get('auth2FAMethod'),
+                        reset: this.options.reset,
+                    })
+                    .then(data => {
+                        this.emailAddressList = data.emailAddressList;
+
+                        this.createView('record', 'views/record/edit-for-modal', {
+                            scope: 'None',
+                            el: this.getSelector() + ' .record',
+                            model: model,
+                            detailLayout: [
+                                {
+                                    rows: [
+                                        [
+                                            {
+                                                name: 'emailAddress',
+                                                labelText: this.translate('emailAddress', 'fields', 'User'),
+                                            },
+                                            false
+                                        ],
+                                        [
+                                            {
+                                                name: 'code',
+                                                labelText: this.translate('Code', 'labels', 'User'),
+                                            },
+                                            false
+                                        ],
+                                    ]
+                                }
+                            ],
+                        }, view => {
+                            view.setFieldOptionList('emailAddress', this.emailAddressList);
+
+                            if (this.emailAddressList.length) {
+                                model.set('emailAddress', this.emailAddressList[0]);
+                            }
+
+                            view.hideField('code');
+                        });
+                    })
+            );
+        },
+
+        afterRender: function () {
+            this.$sendCode = this.$el.find('[data-action="sendCode"]');
+
+            this.$pInfo = this.$el.find('p.p-info');
+            this.$pButton = this.$el.find('p.p-button');
+            this.$pInfoAfter = this.$el.find('p.p-info-after');
+        },
+
+        actionSendCode: function () {
+            this.$sendCode.attr('disabled', 'disabled').addClass('disabled');
+
+            Espo.Ajax
+                .postRequest('TwoFactorEmail/action/sendCode', {
+                    id: this.model.id,
+                    emailAddress: this.internalModel.get('emailAddress'),
+                })
+                .then(() => {
+                    this.showButton('apply');
+
+                    this.$pInfo.addClass('hidden');
+                    this.$pButton.addClass('hidden');
+                    this.$pInfoAfter.removeClass('hidden');
+
+                    this.getView('record').setFieldReadOnly('emailAddress');
+                    this.getView('record').showField('code');
+                })
+                .catch(() => {
+                    this.$sendCode.removeAttr('disabled').removeClass('disabled');
+                });
+        },
+
+        actionApply: function () {
+            let data = this.getView('record').processFetch();
+
+            if (!data) {
+                return;
+            }
+
+            this.model.set('code', data.code);
+
+            this.hideButton('apply');
+            this.hideButton('cancel');
+
+            Espo.Ui.notify(this.translate('pleaseWait', 'messages'));
+
+            this.model
+                .save()
+                .then(() => {
+                    Espo.Ui.notify(false);
+
+                    this.trigger('done');
+                })
+                .catch(() => {
+                    this.showButton('apply');
+                    this.showButton('cancel');
+                });
+        },
+
+    });
+});