> The instructions on the website showed people how to setup the pop
> account to receive from their servers but send through the
> local ISP's smtp server.  The smtp server doesn't care what 
> return address they use in their e-mail program, it just sends 
> the mail.

Actually, the SMTP may well care about the return address.

In the case of the person here (using AT&T, which blocks SMTP access except to their 
SMTP server), his ability to send through Outlook stopped.  AT&T would say that he 
should change the SMTP server from ours to theirs.  Now that *may* work fine at first, 
provided that AT&T's SMTP server allows him to send mail using a non-AT&T return 
address.

However, the problem occurs when he brings his laptop into the office.  When he is in 
the office, he is using our network.  Outlook, which is set to use AT&T's SMTP server, 
isn't going to be able to send through the AT&T server from our network for obvious 
reasons (not using an AT&T IP address, and not to or from an AT&T E-mail address).
                            -Scott
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