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Canit-PRO has a sendmail dependency. If you already run sendmail, however, that shouldn't be a problem. Otherwise, you might want to run it on its own server with sendmail.
When CanIt-PRO is told to reject mail, and it recognizes an incoming message as spam, it issues the following error to the sending server: "451 4.3.0 Message held for human verification before permitting delivery. For help, please quote incident ID 2." The ID number will change, of course.
This is particularly useful, and polite, for administrators of other mail servers. If CanIt-PRO does identify legitimate email as spam, it means that the user on the other end is going to be wondering why his mail is being returned.
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