Zimbra Relay Access Denied [ HD 2024 ]

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.

If you manage a Zimbra Collaboration Suite (ZCS) environment, you’ve likely seen the dreaded "554 5.7.1 <[email protected]>: Relay access denied" error in your mail logs. zimbra relay access denied

Start with authentication (port 587). If that doesn’t work, check your mynetworks . Nine times out of ten, that resolves the issue. In this post, we’ll break down why this

To test if this is the issue, try:

Add the device’s IP address to Zimbra’s “mynetworks” setting. This tells Zimbra, "Trust anything coming from this IP." In this post