diff --git a/application/Espo/Classes/FieldProcessing/InboundEmail/IsSystemLoader.php b/application/Espo/Classes/FieldProcessing/InboundEmail/IsSystemLoader.php
index b943bb1d37..a2ea493fc8 100644
--- a/application/Espo/Classes/FieldProcessing/InboundEmail/IsSystemLoader.php
+++ b/application/Espo/Classes/FieldProcessing/InboundEmail/IsSystemLoader.php
@@ -31,7 +31,7 @@ namespace Espo\Classes\FieldProcessing\InboundEmail;
 
 use Espo\Core\FieldProcessing\Loader;
 use Espo\Core\FieldProcessing\Loader\Params;
-use Espo\Core\Utils\Config;
+use Espo\Core\Mail\ConfigDataProvider;
 use Espo\Entities\InboundEmail;
 use Espo\ORM\Entity;
 
@@ -41,12 +41,12 @@ use Espo\ORM\Entity;
 class IsSystemLoader implements Loader
 {
     public function __construct(
-        private Config $config,
+        private ConfigDataProvider $configDataProvider,
     ) {}
 
     public function process(Entity $entity, Params $params): void
     {
-        $isSystem = $entity->getEmailAddress() === $this->config->get('outboundEmailFromAddress');
+        $isSystem = $entity->getEmailAddress() === $this->configDataProvider->getOutboundEmailFromAddress();
 
         $entity->set('isSystem', $isSystem);
     }
diff --git a/application/Espo/Core/Formula/Functions/ExtGroup/EmailGroup/SendType.php b/application/Espo/Core/Formula/Functions/ExtGroup/EmailGroup/SendType.php
index 59ec405473..d6abc70dfa 100644
--- a/application/Espo/Core/Formula/Functions/ExtGroup/EmailGroup/SendType.php
+++ b/application/Espo/Core/Formula/Functions/ExtGroup/EmailGroup/SendType.php
@@ -30,6 +30,7 @@
 namespace Espo\Core\Formula\Functions\ExtGroup\EmailGroup;
 
 use Espo\Core\ApplicationUser;
+use Espo\Core\Mail\ConfigDataProvider;
 use Espo\Core\ORM\Repository\Option\SaveOption;
 use Espo\Core\Formula\ArgumentList;
 use Espo\Core\Formula\Functions\BaseFunction;
@@ -99,7 +100,9 @@ class SendType extends BaseFunction implements
         }
 
         if (!$email->get('from')) {
-            $from = $this->config->get('outboundEmailFromAddress');
+            $from = $this->injectableFactory
+                ->create(ConfigDataProvider::class)
+                ->getOutboundEmailFromAddress();
 
             if ($from) {
                 $email->set('from', $from);
diff --git a/application/Espo/Core/Mail/Account/SendingAccountProvider.php b/application/Espo/Core/Mail/Account/SendingAccountProvider.php
index 2f15e862af..602c0624df 100644
--- a/application/Espo/Core/Mail/Account/SendingAccountProvider.php
+++ b/application/Espo/Core/Mail/Account/SendingAccountProvider.php
@@ -34,6 +34,7 @@ use Espo\Core\AclManager;
 use Espo\Core\Exceptions\Error;
 use Espo\Core\Mail\Account\GroupAccount\AccountFactory as GroupAccountFactory;
 use Espo\Core\Mail\Account\PersonalAccount\AccountFactory as PersonalAccountFactory;
+use Espo\Core\Mail\ConfigDataProvider;
 use Espo\Core\Name\Field;
 use Espo\Core\Utils\Config;
 use Espo\Entities\EmailAccount as EmailAccountEntity;
@@ -56,7 +57,8 @@ class SendingAccountProvider
         private GroupAccountFactory $groupAccountFactory,
         private PersonalAccountFactory $personalAccountFactory,
         private AclManager $aclManager,
-        private SystemSettingsAccount $systemSettingsAccount
+        private SystemSettingsAccount $systemSettingsAccount,
+        private ConfigDataProvider $configDataProvider,
     ) {}
 
     public function getShared(User $user, string $emailAddress): ?Account
@@ -214,7 +216,7 @@ class SendingAccountProvider
 
     private function loadSystem(): void
     {
-        $address = $this->config->get('outboundEmailFromAddress');
+        $address = $this->configDataProvider->getOutboundEmailFromAddress();
 
         if (!$address) {
             return;
diff --git a/application/Espo/Core/Mail/Account/SystemSettingsAccount.php b/application/Espo/Core/Mail/Account/SystemSettingsAccount.php
index 5ff109ddb2..90a53596b8 100644
--- a/application/Espo/Core/Mail/Account/SystemSettingsAccount.php
+++ b/application/Espo/Core/Mail/Account/SystemSettingsAccount.php
@@ -33,6 +33,7 @@ use Espo\Core\Field\Date;
 use Espo\Core\Field\DateTime;
 use Espo\Core\Field\Link;
 use Espo\Core\Field\LinkMultiple;
+use Espo\Core\Mail\ConfigDataProvider;
 use Espo\Core\Mail\Exceptions\NoSmtp;
 use Espo\Core\Mail\SmtpParams;
 use Espo\Core\Utils\Config;
@@ -41,8 +42,10 @@ use Espo\Entities\Settings;
 
 class SystemSettingsAccount implements Account
 {
-    public function __construct(private Config $config)
-    {}
+    public function __construct(
+        private Config $config,
+        private ConfigDataProvider $configDataProvider,
+    ) {}
 
     public function updateFetchData(FetchData $fetchData): void {}
 
@@ -68,7 +71,7 @@ class SystemSettingsAccount implements Account
 
     public function getEmailAddress(): ?string
     {
-        return $this->config->get('outboundEmailFromAddress');
+        return $this->configDataProvider->getOutboundEmailFromAddress();
     }
 
     public function getAssignedUser(): ?Link
diff --git a/application/Espo/Core/Mail/ConfigDataProvider.php b/application/Espo/Core/Mail/ConfigDataProvider.php
new file mode 100644
index 0000000000..1c8f8eee54
--- /dev/null
+++ b/application/Espo/Core/Mail/ConfigDataProvider.php
@@ -0,0 +1,44 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://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 Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Mail;
+
+use Espo\Core\Utils\Config;
+
+class ConfigDataProvider
+{
+    public function __construct(
+        private Config $config,
+    ) {}
+
+    public function getOutboundEmailFromAddress(): ?string
+    {
+        return $this->config->get('outboundEmailFromAddress');
+    }
+}
diff --git a/application/Espo/Core/Mail/Sender.php b/application/Espo/Core/Mail/Sender.php
index 549acbc692..010cbb03f7 100644
--- a/application/Espo/Core/Mail/Sender.php
+++ b/application/Espo/Core/Mail/Sender.php
@@ -83,7 +83,8 @@ class Sender
         private Log $log,
         private TransportFactory $transportFactory,
         private SendingAccountProvider $accountProvider,
-        private FileStorageManager $fileStorageManager
+        private FileStorageManager $fileStorageManager,
+        private ConfigDataProvider $configDataProvider,
     ) {
 
         /** @noinspection PhpDeprecationInspection */
@@ -371,11 +372,11 @@ class Sender
         if ($fromAddress) {
             $fromAddress = trim($fromAddress);
         } else {
-            if (empty($params['fromAddress']) && !$config->get('outboundEmailFromAddress')) {
+            if (empty($params['fromAddress']) && !$this->configDataProvider->getOutboundEmailFromAddress()) {
                 throw new NoSmtp('outboundEmailFromAddress is not specified in config.');
             }
 
-            $fromAddress = $params['fromAddress'] ?? $config->get('outboundEmailFromAddress');
+            $fromAddress = $params['fromAddress'] ?? $this->configDataProvider->getOutboundEmailFromAddress();
 
             $email->setFromAddress($fromAddress);
         }
@@ -415,7 +416,6 @@ class Sender
         if (!$email->isNew()) {
             /** @var Collection<Attachment> $relatedAttachmentCollection */
             $relatedAttachmentCollection = $this->entityManager
-                ->getRDBRepository(Email::ENTITY_TYPE)
                 ->getRelation($email, 'attachments')
                 ->find();
 
diff --git a/application/Espo/Modules/Crm/Tools/MassEmail/SendingProcessor.php b/application/Espo/Modules/Crm/Tools/MassEmail/SendingProcessor.php
index aa7d1279b1..17e666f992 100644
--- a/application/Espo/Modules/Crm/Tools/MassEmail/SendingProcessor.php
+++ b/application/Espo/Modules/Crm/Tools/MassEmail/SendingProcessor.php
@@ -29,6 +29,7 @@
 
 namespace Espo\Modules\Crm\Tools\MassEmail;
 
+use Espo\Core\Mail\ConfigDataProvider;
 use Espo\ORM\EntityCollection;
 use Laminas\Mail\Message;
 
@@ -80,7 +81,8 @@ class SendingProcessor
         private AccountFactory $accountFactory,
         private CampaignService $campaignService,
         private MessageHeadersPreparator $headersPreparator,
-        private TemplateProcessor $templateProcessor
+        private TemplateProcessor $templateProcessor,
+        private ConfigDataProvider $configDataProvider,
     ) {}
 
     /**
@@ -528,7 +530,7 @@ class SendingProcessor
 
         $senderParams = $senderParams->withFromAddress(
             $massEmail->getFromAddress() ??
-            $this->config->get('outboundEmailFromAddress')
+            $this->configDataProvider->getOutboundEmailFromAddress()
         );
 
         if ($massEmail->getFromName()) {
diff --git a/application/Espo/Tools/App/AppService.php b/application/Espo/Tools/App/AppService.php
index 4e00464fdb..f8f053aee3 100644
--- a/application/Espo/Tools/App/AppService.php
+++ b/application/Espo/Tools/App/AppService.php
@@ -30,6 +30,7 @@
 namespace Espo\Tools\App;
 
 use Espo\Core\Authentication\Util\MethodProvider as AuthenticationMethodProvider;
+use Espo\Core\Mail\ConfigDataProvider as EmailConfigDataProvider;
 use Espo\Core\Name\Field;
 use Espo\Core\Utils\SystemUser;
 use Espo\Entities\DashboardTemplate;
@@ -73,7 +74,8 @@ class AppService
         private FieldUtil $fieldUtil,
         private Log $log,
         private AuthenticationMethodProvider $authenticationMethodProvider,
-        private SystemUser $systemUser
+        private SystemUser $systemUser,
+        private EmailConfigDataProvider $emailConfigDataProvider,
     ) {}
 
     /**
@@ -256,7 +258,7 @@ class AppService
         $user = $this->user;
 
         $outboundEmailIsShared = $this->config->get('outboundEmailIsShared');
-        $outboundEmailFromAddress = $this->config->get('outboundEmailFromAddress');
+        $outboundEmailFromAddress = $this->emailConfigDataProvider->getOutboundEmailFromAddress();
 
         $emailAddressList = [];
         $userEmailAddressList = [];
diff --git a/application/Espo/Tools/App/SettingsService.php b/application/Espo/Tools/App/SettingsService.php
index bb0d726c3a..f12906b71e 100644
--- a/application/Espo/Tools/App/SettingsService.php
+++ b/application/Espo/Tools/App/SettingsService.php
@@ -29,6 +29,7 @@
 
 namespace Espo\Tools\App;
 
+use Espo\Core\Mail\ConfigDataProvider as EmailConfigDataProvider;
 use Espo\Core\Utils\ThemeManager;
 use Espo\Entities\Settings;
 use Espo\ORM\Entity;
@@ -70,6 +71,7 @@ class SettingsService
         private AuthenticationMethodProvider $authenticationMethodProvider,
         private ThemeManager $themeManager,
         private Config\SystemConfig $systemConfig,
+        private EmailConfigDataProvider $emailConfigDataProvider,
     ) {}
 
     /**
@@ -251,7 +253,10 @@ class SettingsService
         }
 
         if (
-            ($this->config->get('outboundEmailFromAddress') || $this->config->get('internalSmtpServer')) &&
+            (
+                $this->emailConfigDataProvider->getOutboundEmailFromAddress() ||
+                $this->config->get('internalSmtpServer')
+            ) &&
             !$this->config->get('passwordRecoveryDisabled')
         ) {
             $data->passwordRecoveryEnabled = true;
@@ -280,9 +285,9 @@ class SettingsService
             }
         }
 
-        if ($this->isRestrictedMode() && !$user->isSuperAdmin()) {
+        /*if ($this->isRestrictedMode() && !$user->isSuperAdmin()) {
             // @todo Maybe add restriction level for non-super admins.
-        }
+        }*/
 
         foreach ($ignoreItemList as $item) {
             unset($data->$item);
diff --git a/application/Espo/Tools/Email/SendService.php b/application/Espo/Tools/Email/SendService.php
index 26fe46805f..00fc90dc30 100644
--- a/application/Espo/Tools/Email/SendService.php
+++ b/application/Espo/Tools/Email/SendService.php
@@ -44,6 +44,7 @@ use Espo\Core\Mail\Account\PersonalAccount\Account as PersonalAccount;
 use Espo\Core\Mail\Account\PersonalAccount\AccountFactory as PersonalAccountFactory;
 use Espo\Core\Mail\Account\PersonalAccount\Service as PersonalAccountService;
 use Espo\Core\Mail\Account\SendingAccountProvider;
+use Espo\Core\Mail\ConfigDataProvider;
 use Espo\Core\Mail\EmailSender;
 use Espo\Core\Mail\Exceptions\NoSmtp;
 use Espo\Core\Mail\Exceptions\SendingError;
@@ -96,7 +97,8 @@ class SendService
         private GroupAccountService $groupAccountService,
         private HandlerProcessor $handlerProcessor,
         private PersonalAccountFactory $personalAccountFactory,
-        private GroupAccountFactory $groupAccountFactory
+        private GroupAccountFactory $groupAccountFactory,
+        private ConfigDataProvider $configDataProvider,
     ) {}
 
     /**
@@ -126,7 +128,7 @@ class SendService
 
         $systemIsShared = $this->config->get('outboundEmailIsShared');
         $systemFromName = $this->config->get('outboundEmailFromName');
-        $systemFromAddress = $this->config->get('outboundEmailFromAddress');
+        $systemFromAddress = $this->configDataProvider->getOutboundEmailFromAddress();
 
         $emailSender = $this->emailSender->create();
 
@@ -136,7 +138,6 @@ class SendService
             // @todo Use getEmailAddressGroup.
             /** @var Collection<EmailAddress> $emailAddressCollection */
             $emailAddressCollection = $this->entityManager
-                ->getRDBRepositoryByClass(User::class)
                 ->getRelation($user, 'emailAddresses')
                 ->find();
 
@@ -154,7 +155,7 @@ class SendService
         $fromAddress = strtolower($originalFromAddress);
 
         $isUserAddress = in_array($fromAddress, $userAddressList);
-        $isSystemAddress = $fromAddress === strtolower($systemFromAddress);
+        $isSystemAddress = $fromAddress === strtolower($systemFromAddress ?? '');
 
         $smtpParams = null;
         $personalAccount = null;