I connect to my mail server through my ISPs NAT router, whose IP address is constantly being blacklisted because of virus activity within the network. When I send an email using my server, postfix inserts the header
Received: from HOSTNAME (Unknown[<My nats IP>])
which usually causes the outbound message to have a very high score because I get these:
RCVD_IN_XBL: <my NATs IP> listed insbl-xbl.spamhaus.org
in my @spam_admin notifications.
My question is what is the best practice so that my outbound email is not getting blocked by anyone using the spamhaus blacklist.
I have thought about using postfix to strip the headers out, using the postfix command header_checks, but just curious if you have any advice on the subject.