On Tuesday 01 August 2006 23:44, Gregory EID wrote: > Squid is running on same machine as my firewall Shorewall doing NAT so > all outgoing emails have the same IP of Shorewall 196.44.102.241 > > When a client sends outgoing email using port 80 bypassing our SMTP > server (using port 25) the IP address that recipients see is our > Shorewall and we are concerned that anti-spam databases will blacklist > our Shorewall IP, which will block our entire network. Which decent external SMTP mail server is listening on any port but 25 (SSL ports aside)? Christoph