It is perfectly legal for mail from a relay domain to arrive from
outside of your networks. (a simple alias for a "mailing list" is one
example of a situation that is not uncommon, and produces this behavior.
That it's a stupid configuration for a "mailing list" does not make it
any less legal.)
If you say that mail should be relayed for a domain (by putting it in
$relay_domains), then you have told postfix to allow mail to that domain
regardless of the source of the mail.
** Changed in: postfix (Ubuntu)
Assignee: (unassigned) => LaMont Jones (lamont)
Status: New => Invalid
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postfix allows unauthorised relay_domain spamming
https://bugs.launchpad.net/bugs/160945
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