Jeff Peng via Postfix-users:
> Hello Wietse,
>
> I have added this line:
> smtpd_reject_unlisted_sender = yes
>
> into main.cf.
> May I ask, this option is for submission request, or for MX request?
All services that use smtpd.
Wietse
> On 2024-06-14 04:14, Wietse Venema via Postfix-users wrote:
> > 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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