Re: IIS 5's SMTP and Stopping NDR's ?

I didn't know that could be done. Can you elaborate on how this is
accomplished using Exchange 2000 and
a separate SMTP machine as a relay? If I can get the mail server to just
reject all connection attempts to non-existant mailboxes that would be a lot
better :-)

5xxSink is a transport event sink specifically designed for the rejection of
unknown recipients at the MX.

Download:

http://www.imprimia.com/products/software/freeutils/5xxsink/download/release

Be sure to go over the README and RELNOTES in-depth.

I don't know much about that - all I know is that my IIS 5 SMTP machine is
kindly sending NDR reports for every email it receives that is not addressed
to an existing mailbox. Of course, the account used to send the mail does
not exist so it's a waste for everyone.

Quite so. For you, the waste is abetted by accepting the mail in the
first place. *Just* because something was sent to a nonexistent
mailbox doesn't mean it was spam -- as such user errors occur, in
small but non-negligible quantity, all the time.

Your server is absolutely correct to generate an NDR by default, in
the absence of any spam detection at that level. When the sender is
legit, the NDR is invaluable.

When the sender is forged or does not exist, the NDR is extremely
problematic, one the first hand making you complicit in Joe Jobs, and
on the second resulting in postmaster messages (double-bounce
notifications).

--Sandy
.

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