On Tue, 2003-10-28 at 20:36, James W. Thompson, II wrote: > When sendmail sends mail destined for outside my server what port is it > coming from and what port is it going to? 25? And does it use TCP, UDP > or both? > > -Dubbs > I believe sendmail uses TCP port 25, and ipopd uses TCP port 110. Least that's how I configured my Linksys router for port-forwarding and it's working.