SMTP Service

I have a W2K box that runs just the SMTP service.  It's used to send out emails 
to a couple thousand subscribers to our reminder service a couple of times a 
month.  These are emails put into the SMTP server's queue by a custom 
application that generates them.  We don't actually use Exchange or anything 
else on this box, it's just a stand-alone unit isolated from our corporate 
network for safety's sake.

I'm a bit of an email administration virgin, so forgive me if this is a naive 
question ... but if I uncheck the box in the SMTP service that allows anonymous 
logins, so that I'm not an open relay -- then any mail that gets sent to that 
box gets bounced.  How do I allow emails to my own domain in, from all comers, 
without being an open relay?  I want to catch repy-to's and bounces of the 
mails I'm sending.

The bounce error says, "relay refused" but that wouldn't be a relay, it'd be a 
delivery.

I've Googled around but can't find anything that addresses my scenario.

--Bob

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