Brian Leyton wrote:
>
> What it comes down to is that I have a Linux machine at the front-end,
> running MimeDefang, Spamassassin, etc., which passes everything it hasn't
> rejected on to an old Exchange Server.  I can't turn off the bounce messages
> at the Exchange Server (for various stupid reasons that only Bill Gates
> could explain), but I have no way of rejecting mail at the Linux machine,
> because I don't know which addresses are valid.
>
> I'm still working on a way to do this - I'm sure it's not impossible, but I
> haven't had much success yet.  Ideally, the Linux machine would do an LDAP
> query to the Exchange server, but unless you can help me figure out how to
> do it,  then I guess I'll just remain a "f*cking idiot admin".

It's fairly straightforward with Exim.

http://www.exim.org/eximwiki/MsExchangeAddressVerification

Tony.
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