On Sun, 9 Mar 2008, Tuc at T-B-O-H.NET wrote:

        But it still remains, I'm looking to find what people think is
the best way on an MX host to do the rejecting at SMTP time.

I'm coming to this conversation kind of late, so I apologize if I've
missed something important earlier in the thread, but it sounds like
what you want is a call-ahead milter (an example is at
http://www.snertsoft.com/sendmail/milter-ahead/).

Call-ahead milters allow MXs to contact the ultimate destination
server, determine whether an address is valid at the end of the
line and then take various actions, including rejection.

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