I have done something similar with exim (backend user lookups into AD), SASL and
LDAP. I believe that postfix also supports kerberos, since AD is built around
kerberos you could authenticate that way. Though I am not all that familar
with postfix, this probably does not help you unless your users have laptops
that authenticate to the domain before going home (windows 2000 and later cache
the kerberos tickets).

What version of exchange? How are users authenticating to your exchange server?
(I assumed that AD was being used)
--
No trees were harmed in the transmission of this message, however a large number
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Quoting Martin Glazer <[EMAIL PROTECTED]>:

Hey All,

I have setup a client of mine to use Postfix to relay incoming mail to an
internal Exchange server - works perfectly

Now however, they want to enable SMTP authentication on the Exchange server in
order to let people send email from home.

Does anyone know how to do this using Postfix as the front end to Exchange or
can suggest another method of  accomplishing this?

Thanks

Martin

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