.... One other piece of informaion, it works fine on my home netowrk when I'm plugged in at home, but when I'm on travel using the NetZero dialup it doesn't work!!!! Thanks.
NetZero is probably blocking outgoing connections to port 25. They do this to stop spammers from using their dial up service. Try setting up your Sendmail daemon to listen on a higher port or try setting up iptables to redirect a higher port to port 25.
Then you will have to reconfigure your Outlook client to connect to the high port.
BTW, you might also be having a "relay" problem, by default
(and it is a _*GOOD*_ thing) sendmail from redhat doesn't do relay
traffic. One way that I handle this is to set up an SSH tunnel on my
e-mail client (the SMTP sender) that redirects the clients port 25 to the
remote MTA's port 25. There is a great little windows SSH tunnel client
that can sit in your systray and pop open a tunnel when you connect to
a localhost port.
http://www.delight.ch/
This site uses frames so you have to dig through their products till you find
ssh-tunnel.
It is an awesome little free utility!!!!
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