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You can create an backup with a command like: zmmailbox -z -m mail@domain.com -t 0 getRestURL "//?fmt=tgz" > /tmp/mailbox.tgz Where -t sets the timeout to infinity. You are creating a REST command to Zimbra, so you can extend this with compatible commands. For example, you can add a query to this to select message before a specific date: zmmailbox -z ...


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Make sure the rDNS (PTR record) for the IP matches the SMTP banner. For example, if you telnet x.x.x.x 25 and the banner returns mail.domain.com, you'll need to set the PTR to match the banner (i.e. mail.domain.com). You then need to allow sufficient time (based on TTL and DNS cache) for the changes to propagate before re-trying to send the email.


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This is not about Zimbra, but about configuring the DNS correctly. You should setup the reverse DNS (PTR record) correctly.


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You probably won't be able to find more info, as the message is rejected before any data was transferred. Every SMTP mail session begins with sending the sender and receiver and only when that succeeded the rest of the e-mail is transferred.



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