I know this isn't qmail specific and I apologize, but I know a LOT of people
on this list will know the answer.  I have looked through several RFCs
(probably the wrong ones!) and still can't find a definite confirmation of
how I think this works.  (Can anyone recommend a good overview of the email
system?  I am, of course, waiting on the qmail book too!)

The setup:  Dial-up access is provided on one linux box.  qmail is running
on another.  Both boxes have permanent connections to the internet through
the LAN.  Almost all dial-up users use Windoze for connecting and reading
e-mail - if that matters.

My very fuzzy understanding of how this works:  Windoze connects to the
dial-up server and uses the dial-up server's port 25 to connect to the qmail
server's port 25 to send/receive mail.  Is that it, or am I missing the big
picture - again?

The point of this (other than the joy of figuring out how it works :) is
that they now want to limit some users to sending and receiving e-mail only.
If I understand correctly, I just need to find a way to limit those users to
accessing only port 25 of the dial-up server. ?

TIA
        -wade

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