I'm getting lots of junk "return to delivery" mail on my server, so I would like to add this "RDNS" lookup thing in Ubuntu.
But I can't figure out how. Most documentation is about regular DNS servers.
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Assuming from the tagging of the question that your mail server software is Postfix, you can tune this via the smtpd_client_restrictions variable as described in postconf(5) | |||
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