Announcing the “noreply” string is now reserved for support addresses on Zendesk domains

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<td style="height: 22px; width: 33.3333%;"><strong>Announced on</strong></td>
<td><strong>Rollout starts</strong></td>
<td style="height: 22px; width: 33.3333%;"><strong>Rollout ends</strong></td>
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<td style="height: 22px; width: 33.3333%;">June 8, 2026</td>
<td>August 10, 2026</td>
<td style="height: 22px; width: 33.3333%;">August 21, 2026</td>
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</table></figure><p>Zendesk is standardizing its email security infrastructure by reserving the specific "noreply" text string for support addresses for internal system usage. Therefore, if your account uses a support address with the specific "noreply" string on a Zendesk domain, you must migrate to an alternative address. </p><p>This update ensures reliable, standardized fallback communication when customer connections are unavailable and helps prevent confusion regarding system emails.</p><p>This change only applies to support addresses on a Zendesk domain (such as <em>yoursubdomain</em>.zendesk.com). If you use an external "noreply" address via an email connector or standard email forwarding (such as noreply@<em>yoursubdomain</em>.com), your account is not affected.</p><p>This article includes these sections:</p><ul>
<li data-list-item-id="e6f3fd2c09cb4a6bf05c7cc9143bb07ca"><a href="#h_01K39FKN2ZKQS92V5424YQV505">What's changing?</a></li>
<li data-list-item-id="e19d96eb6030b304d37f970049f1f3cf3"><a href="#h_01K3A7DY1MGYWC5Z9FE5WEZMD9">Why is Zendesk making this change?</a></li>
<li data-list-item-id="e7db2ab7ccf8acfe717d5d5ab61dfad31"><a href="#h_01K3A7FEPQBH8P3JPGKNBZRT8C">What do I need to do?</a></li>
</ul><h2 id="h_01K39FKN2ZKQS92V5424YQV505">What's changing?</h2><p>Zendesk is reserving the specific "noreply" string for system-generated support addresses on Zendesk domains (for example, noreply@<em>yoursubdomain</em>.zendesk.com).</p><p>As a result of this update:</p><ul>
<li data-list-item-id="eb1a279b72387d3941892e717029e84b3">You can no longer create new support addresses that use the exact "noreply" string on a Zendesk domain and any +id noreply address such as noreply+id@<em>yoursubdomain</em>.zendesk.com.</li>
<li data-list-item-id="ea38ca1c2cd24458c29fcde287314604e">If you currently use a support address on a Zendesk domain containing this exact string, you must migrate to a new support address.</li>
<li data-list-item-id="eec061b99dd5b4f3512e1878ac11ce6a5">Once the rollout is complete, Zendesk will begin rejecting incoming mail sent to these exact "noreply" domain addresses with an SMTP 550 error response.</li>
</ul><h2 id="h_01K3A7DY1MGYWC5Z9FE5WEZMD9">Why is Zendesk making this change?</h2><p>This update is part of ongoing security improvements to our native support address architecture. Zendesk requires dedicated, reserved fallback addresses to safely transmit messages to end users if a customer's primary email connection goes down. Reserving the "noreply" string standardizes this behavior across all internal Zendesk senders and ensures clear, consistent routing for last-resort system communications.</p><h2 id="h_01K3A7FEPQBH8P3JPGKNBZRT8C">What do I need to do?</h2><p>If your account uses the specific "noreply" string on a Zendesk domain, you must migrate to an alternative address. </p><p>To maintain uninterrupted email service, update your support address to a variation that does not exactly match the reserved string, such as no_reply@<em>yoursubdomain</em>.zendesk.com.</p><p>See the Zendesk Help Center for more information on <a href="https://support.zendesk.com/hc/en-us/articles/4408842868506" target="_blank" rel="noopener noreferrer">adding</a> and <a href="https://support.zendesk.com/hc/en-us/articles/5279521301914" target="_blank" rel="noopener noreferrer">managing support addresses</a>.</p><p>If you have feedback or questions related to this announcement, visit our<a href="https://community.zendesk.com/ideas" target="_blank" rel="noopener noreferrer"> <span class="wysiwyg-underline">community forum</span></a> where we collect and manage customer product feedback. For general assistance with your Zendesk products, contact<a href="https://support.zendesk.com/hc/en-us/articles/4408843597850" target="_blank" rel="noopener noreferrer"> <span class="wysiwyg-underline">Zendesk Customer Support</span></a>.<br><br> </p>