iis smtp nntp: I'm using an IIS SMTP inside a Win Serv 2003 Web Edition as a relay to
an Exchange server, using the instructions published here:
http://support.microsoft.com/default.aspx?kbid=324272

So far so good. Besides this basic configuration, I'd like to go a bit
further. Actually, I see that some spams are sent to invalid e-addresses
(due to users gone) with the following apparent consequences:
1. spams are placed in badmails.
2. a mail is sent back to the sender. If such sender doesn't exist, the
mail is rebounced back.

With the enormous quantities of spams, these are really additional
waste of bandwidth. So I would rather like the SMTP server refuses these
invalid e-addresses. I've looked through everywhere but still can't find
anything close to what I want. Did I miss something or is it just impossible?

[quoted text, click to view]

Yep, preventing mail from being accepted to nonexistent recipients is
perhaps the primary concern of anyone putting up a public mailserver.
It is crucial to prevent this.

I have published in the past an add-on that adds this capability.
Unfortunately, the 2-year-old code has fallen into disrepair and it is
unstable on fully patched OSs at this point. The main reason I haven't
kept up development is that I have moved primarily to using Vamsoft's
ORF, which does this function and much more and is a very capable
anti-spam/anti-abuse platform for IIS SMTP. It's a commercial product
(with which I have no affiliation). You can write me privately for
more info.

--Sandy



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Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.