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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<title>SMTP Delivery Help</title>
<link rel="stylesheet" href="assets/styles.css" />
</head>
<body>
<div class="container">
<div class="topbar">
<div class="brand">
<div class="brand-mark" aria-hidden="true"></div>
<div class="brand-title">
<strong>SMTP Delivery Help</strong>
<span>Plain-English explanations & next steps</span>
</div>
</div>
<nav class="nav">
<a class="pill" href="#temporary">Temporary (4xx)</a>
<a class="pill" href="#permanent">Permanent (5xx)</a>
</nav>
</div>
<section class="hero">
<div class="hero-inner">
<div>
<h1>Find the error code. Understand it fast.</h1>
<p class="lead">
Use this guide when email bounces or delays. Each code has a dedicated page with a plain-language explanation,
what it usually means for your office, and the best next step.
</p>
<div class="cta-row">
<a class="btn primary" href="codes/421-4-3-2.html">Start with 421 4.3.2</a>
<a class="btn" href="#faq">FAQ</a>
</div>
<div class="small-note">Temporary (4xx) usually means “retry later.” Permanent (5xx) usually means “fix something first.”</div>
</div>
<aside class="side">
<h3>How to use this site</h3>
<ul>
<li>Open the code page to understand what it means.</li>
<li>Use the “Quick next step” for immediate guidance.</li>
<li>For deeper steps, open “What to do” (subpage).</li>
</ul>
</aside>
</div>
</section>
<div class="section-title" id="temporary">Temporary errors (4xx)</div>
<section class="grid">
<div class="card"><h2><a href="codes/421-4-3-2.html">421 4.3.2</a></h2><p>Service not available (system problem)</p></div>
<div class="card"><h2><a href="codes/421-4-4-2.html">421 4.4.2</a></h2><p>Connection timed out / network issue</p></div>
<div class="card"><h2><a href="codes/421-4-7-0.html">421 4.7.0</a></h2><p>Temporary mail problem</p></div>
<div class="card"><h2><a href="codes/450-4-2-0.html">450 4.2.0</a></h2><p>Mailbox unavailable (temporary)</p></div>
<div class="card"><h2><a href="codes/450-4-7-1.html">450 4.7.1</a></h2><p>Message temporarily deferred</p></div>
<div class="card"><h2><a href="codes/451-4-3-0.html">451 4.3.0</a></h2><p>Temporary server failure</p></div>
<div class="card"><h2><a href="codes/452-4-2-2.html">452 4.2.2</a></h2><p>Mailbox full (temporary quota)</p></div>
</section>
<div class="section-title" id="permanent">Permanent errors (5xx)</div>
<section class="grid">
<div class="card"><h2><a href="codes/500-5-5-1.html">500 5.5.1</a></h2><p>Command unrecognized / syntax error</p></div>
<div class="card"><h2><a href="codes/501-5-5-2.html">501 5.5.2</a></h2><p>Syntax error in parameters</p></div>
<div class="card"><h2><a href="codes/503-5-5-1.html">503 5.5.1</a></h2><p>Bad sequence of commands</p></div>
<div class="card"><h2><a href="codes/504-5-5-4.html">504 5.5.4</a></h2><p>Command parameter not implemented</p></div>
<div class="card"><h2><a href="codes/530-5-7-0.html">530 5.7.0</a></h2><p>Authentication required</p></div>
<div class="card"><h2><a href="codes/535-5-7-8.html">535 5.7.8</a></h2><p>Authentication credentials invalid</p></div>
<div class="card"><h2><a href="codes/550-5-1-0.html">550 5.1.0</a></h2><p>Invalid recipient address</p></div>
<div class="card"><h2><a href="codes/550-5-1-1.html">550 5.1.1</a></h2><p>Recipient address not found</p></div>
<div class="card"><h2><a href="codes/551-5-1-1.html">551 5.1.1</a></h2><p>User not local / please try another path</p></div>
<div class="card"><h2><a href="codes/552-5-2-2.html">552 5.2.2</a></h2><p>Mailbox full (quota exceeded)</p></div>
<div class="card"><h2><a href="codes/553-5-1-3.html">553 5.1.3</a></h2><p>Bad destination mailbox address</p></div>
<div class="card"><h2><a href="codes/550-5-1-8.html">550 5.1.8</a></h2><p>Sender address rejected</p></div>
<div class="card"><h2><a href="codes/550-5-2-0.html">550 5.2.0</a></h2><p>Mailbox disabled / not accepting mail</p></div>
<div class="card"><h2><a href="codes/550-5-4-1.html">550 5.4.1</a></h2><p>No answer from host (routing)</p></div>
<div class="card"><h2><a href="codes/550-5-4-6.html">550 5.4.6</a></h2><p>Routing loop / too many hops</p></div>
<div class="card"><h2><a href="codes/550-5-7-0.html">550 5.7.0</a></h2><p>Message rejected by mail policy</p></div>
<div class="card"><h2><a href="codes/550-5-7-1.html">550 5.7.1</a></h2><p>Access denied / policy rejection</p></div>
<div class="card"><h2><a href="codes/550-5-7-26.html">550 5.7.26</a></h2><p>Unauthenticated email rejected</p></div>
<div class="card"><h2><a href="codes/554-5-7-0.html">554 5.7.0</a></h2><p>Transaction failed (policy/content)</p></div>
<div class="card"><h2><a href="codes/554-5-7-1.html">554 5.7.1</a></h2><p>Rejected for security reasons</p></div>
</section>
<div class="section-title" id="faq">Mini-FAQ</div>
<section class="grid">
<article class="card">
<h2>Does this mean our email is “down”?</h2>
<p>Not always. Many 4xx errors are temporary and resolve automatically. 5xx errors usually require a correction before retrying.</p>
</article>
<article class="card">
<h2>What should we send to support?</h2>
<p>Sender, recipient, date/time (timezone), and the full bounce/error text (or screenshot). That’s usually enough to diagnose quickly.</p>
</article>
</section>
<footer class="footer">
<span>Source: SMTP error list derived from your reference page.</span>
<span><a href="#temporary">Back to top</a></span>
</footer>
</div>
</body>
</html>