I posted a sendmail problem last week, explaining most mail on a new Fedora server gets trapped in the mail queue, marked with a deferred connection status. Once and a while some messages will be delivered after a reboot, or a reboot of the firewall. I decided it was a firewall issue, so we did a new install of IPCop 1.46. I still have the same problem, so I uninstalled and reinstalled the sendmail rpm, and removed the loop back statement in the m4 file. In a shell I can ping any domain from the mail server, and I can telnet to the server via port 25, getting the welcome banner. However, I just tried the reverse; attempting to telnet to a working mail server on port 25 from the problem box. the telnet command hung, and never did make a connection to the other server. this was done with IPtables disabled. Any ideas what to look for?