Does this sort of thing not exist? or is it not a good idea?I do this with sendmail and spamass-milter [1]. I don't think it's a great way of doing things, but it does work well on my box. I certainly would be weary of using it in production.
It basically uses the libmilter sendmail hooks to do parsing of the message during the SMTP conversation.
You can do a lot of user level checking by using something like 'access.db' in sendmail, I'm sure the other MTA's have a similar function.
Sendmail and postfix have inbuilt RBL checks, if you enable them. After recent events [2], I'd be weary about enabling them on their own.
TG
[1] http://bandcamp.tv/spamass-milter/index.html [2] One of the main RBL's got DOS'ed and gave positives to every query
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