> I have a T1 connection running into a linux machine using ipmasq. > Everything works fine. Except, my ISP is sending all email send to my > domain to my linux machine. Is it possible to get the linux machine to just > pass it along to another machine on the inside network that runs the > mailserver. FWIW, it's redhat 5.2 (2.0.36), and the mailserver is MS > Exchange 5.5 running IMS. Yes. ipportfw is what I use. It's at http://www.ox.compsoc.org.uk/~steve/portforwarding.html I've also tried redir at http://www.geocities.com/SiliconValley/Heights/2288/redir_0.7.orig.tar.gz and the proper way to do it for firewalling is smap which is part of the firewall toolkit at http://www.tis.com/ .