Can't send over Server Port 25

I recently upgraded to Tiger and can RECEIVE email (for my pop account) but can't SEND over Server Port 25. What other ports can I use to get past the firewall or whatever is causing this problem.
What exactly should be written in setting up the "Outgoing Mail Server" info. I'm trying to send email out via my adelphia.net account and of course, using my user name. Should it be typed as "smtp.adelphia.net"?
Also, how do I edit out the past server settings? I delete them in the "edit server" option but they reappear later in my list of servers.
Thanks in advance for any help in these matters.
Sam
G4 450 & 600 Dual iBook   Mac OS X (10.4.8)   G4 using OWC 1.5 Ghz upgrade card

Most SMTP provided by cable ISP, do not require a
separate Authentication, but rather are either
authenticated by SMTP after POP3, or by the IP
address of the modem. If you are using Password
authentication in the setup of the Outgoing Server,
change to None, and remove the Password and Username
entries, and test.
In Mail, the equivalent of Outlook Express setting of
use the same settings for the outgoing, as on the
incoming, is an Authentication of None. Separate
password authentication of the Outgoing Server is
only used for those servers where the Username must
be appended to the name of the SMTP. Where not
needed, attempting a separate, redundant,
authentication on the Outgoing will cause failure.
Ernie
Ernie, you're a genius! Thanks for helping me figure this out. I greatly appreciate the solution to my problem. Getting rid of the second password authentification (for outgoing server) did the job!
Sam

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