Jeff Koch wrote:
Hi:
Does anyone happen to know why all emails received by qmail are reported
as 'Received: from unknown' even though the sending mailserver clearly
identifies itself and has reverve DNS setup?
Here's a good example from an email I just recieved:
Received: from unknown (HELO lists.sourceforge.net) (216.34.181.88)
That suggests the reverse dns lookups are failing on that server. Have
you tried some lookups manually to see if they are working? I had an
issue similar to this just recently with a new server and it took a
while to realise that I had made a mistake in the nssswitch.conf file
and it was trying to resolve everything via ldap instead of via dns.
Shane
