Zimbra Relay Access Denied May 2026

Start with authentication (port 587). If that doesn’t work, check your mynetworks . Nine times out of ten, that resolves the issue.

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In this post, we’ll break down why this happens and the three most common ways to fix it. An SMTP relay is when a mail server accepts a message and delivers it to a domain that is not its own. Start with authentication (port 587)

To test if this is the issue, try:

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