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A server has multiple domains, each having its respective return-path and from (identical for each domain): [email protected] and [email protected]

While this detailed answer provides useful paths for different versions of postfix, I wonder if there is not a simpler solution, as each domain happens to point to the same mail server.

Can it not be devised to take the domain of the sender and use mail.domain.tld for myhostname.

Jerome
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  • But why? Doesn't offer any advantage to have multiple myhostname's. All domains can use the myhostname. – Sandor Marton Sep 02 '18 at 11:34
  • right, but the email header then shows the value of myhostname in the line `Received: from www.someother.ws` and that could be a spam flag... – Jerome Sep 02 '18 at 12:24
  • Nope, why would be a spam flag ? As long that IP is allowed to send mail for the domain ( SPF etc ), the hostname translates to the IP, and maybe reverse IP points back to hostname, everything should be ok. – Sandor Marton Sep 02 '18 at 13:34
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    That's not a spam flag at all. Trying to fake it, as you are proposing, is a spam flag. – Michael Hampton Sep 02 '18 at 13:36
  • @MichaelHampton . That is an interesting observation. if both domains are allowed to send mail, then it is not faking it. My worry is that different domains with different users have different activity and thus the single myhostname *could* be affected negatively. – Jerome Sep 02 '18 at 13:41
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    The problem there isn't so much the hostname as the IP address. If you really want to separate domains' reputation, you'll need to keep them on separate IP addresses. – Michael Hampton Sep 02 '18 at 13:43
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    @MichaelHampton Point well taken. – Jerome Sep 02 '18 at 13:46

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