If I have a server running (1.26) that simply does smtprelay, can I place a user list somewhere so it will simply drop messages to users NOT in the list? Dictionary attacks are killing me.

There isn't anything in MailRoot/custdomains except for the tab file for the relay. It doesn't appear that smtp filtering with the pre or post tab files have syntax to handle such a thing.

Any suggestions? Cumbersome as it may be, I don't have such a large bunch of users that I can't easily maintain this list of allowed recipients.

Thanks!
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