Deeztek Support:
> On another topic, I had an issue the other day where an outside
> sender was trying to send e-mail to an internal recipient and their
> e-mail was getting delayed due to a DNS issue on their end. The
> exact error was:
>
> (Host or domain name not found. Name service error for name=rotary.org
> type=MX: Host not found, try again)
>
> I'm assuming this was happenning due to the reject_unknown_sender_domain
> in my smtpd_recipient_restrictions. It eventually got fixed and
> the e-mail was able to get delivered however in the meantime what
> would be the best way to bypass that person's e-mail address so
> that e-mail will still get delivered even though their server is
> misconfigured?
Manual whitelisting.
/etc/postfix/main.cf:
smtpd_recipient_restrictions =
...
reject_unauth_destination
check_sender_access hash:/etc/postfix/sender_access
reject_unknown_sender_domain
/etc/postfix/sender_access:
rotary.org OK
Postfix currently does not remember the result of previous
reject_unknown_sender_domain tests, so it cannot automatically
permit a site to send mail based on previous results.
Wietse
