Server used as a relay

[bhwong]

It appears that one of our Zimbra server has been used as a relay for domains not hosted on our server. Is there any way we can configure Zimbra to allow only domains that are hosted within itself to send email?

[phoenix]

It appears that one of our Zimbra server has been used as a relay for domains not hosted on our server. Is there any way we can configure Zimbra to allow only domains that are hosted within itself to send email?

That is the default configuration, a Zimbra server will not relay anything and only accept mail for it's own domains.

You need, however, to give more information on what the exact problem is and some examples of what's in the log files.

[phoenix]

I've also moved this to a new thread as the one you'd added it to is almost three years old and isn't even the same topic as your question.