Help and advice with relaying mail problem



At my college, from my office I can, using say, Mozilla Firefox, login
with a UserID and password onto our mail system, and reply to any
e-mail sent from anywhere. This summer I've had to work a bit from
home, and there's a problem: If someone sends me an e-mail from the
same domain I'm in (say I'm prof01@xxxxxxxx and the e-mail comes from
prof02@xxxxxxxx), I can use Firefox from home, log in to the e-mail
system (as above), and everything works just as it does from the
office.
However, if an e-mail comes in from any other domain (say
colleague@xxxxxxxx), and I try to answer from home, I get the message
(from Firefox): "An error occurred while sending mail. The mail server
responded: Relaying denied."
I've looked this up and at least one place
(http://www.gammadyne.com/relaying_denied.htm says, in part,
"To use a mail server, you must prove to the mail server that you are
authorized to send email.

* The sender of the email must be a user on the server.

Doesn't the act of my signing in using my UserID and password
authenticate me to the e-mail program?

This doesn't make sense to me, and I'd like to ask knowledgeable users
if my question (above) is a reasonable one, before I bring this whole
thing up with our IT people.

Thanks in advance.

.



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