spaceman:
> Hi,
>
> I have a destination and a relay postfix. Both have the following
> (with a few extra for the destination):
>
> smtpd_sender_restrictions = reject_non_fqdn_sender,
> reject_unknown_sender_domain, permit
>
> The destination rejects emails as it is supposed to, however the
rejects what? non-fqdn sender? unknown sender domain?
The Postfix SMTP client by default does not send non-fqdn MAIL FROM
or RCPT TO addresses.
> relay does not. This means that the destination rejects emails
> from the relay.
>
> How can I configure the relay to reject emails (non fqdn, unknown
> domain) so that they never reach the destination?
>
> I need the relay because the destination is down quite a bit.
Check your relay's DNS server. Some ISPs helpfully replace "not
found" DNS results with the address of their own 'support' website.
That would definitely break Postfix's reject_unknown_sender_domain
feature.
Wietse
