Wietse Venema via Postfix-users:
> A paranoid configuration could add:
>
> smtpd_reject_unlisted_sender = yes
>
> That is, do not send mail with a sender address that is known to
> be invalid (the SMTP server would reject mail for the address with
> "user unknown").
>
> For more details (what is valid, why reject invalid senders) see
> https://www.postfix.org/postconf.5.html#smtpd_reject_unlisted_sender
This will respect address extensions, because it reuses the logic for
rejecting unknown recipients. Less code, more functionality.
Wietse
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