From: Wietse Venema (no email)
Date: Tue Sep 05 2006 - 07:45:52 EDT
> My server just received a (spam) message that it forwarded to another
> host. That host rejected it, so my server bounced it. However, the
> Sender address of the message was bogus : MX for that particular
> domain is set in DNS to "0.0.0.0". It ended up in a loop on my
> machine !
> Aren't DNS queries results "sanitized" in postfix ? I cannot believe
> it. Or does it result from a special configuration that I may have
> messed up with ?
There are lots of IP ranges that one might not want in MX lookup
results, but different sites have different lists.