ActiveState PureMessage Tested for UnixReview
PureMessage is a full-featured mail filtering system that can be used as a combination filter/MTA solution or a standalone filter that passes messages on to a MTA for delivery.
The program, however, has features beyond spam filtering and virus blocking. You can also use PureMessage to attach "banners" to email, redirect mail, and even check spelling on corporate keywords. There's a certain "Big Brother" aspect to some of these features that kind of bugs me, but I understand that they're in high demand amongst corporate types. I can also see some potential for abuse — imagine a disgruntled mail admin deciding to filter outgoing email, changing the CEO's "From" header from the CEO's name to "The Jerk Who Runs this Place" (or worse).
Apparently, according to the product information, you can also use the PureMessage API to develop "custom filtering solutions", though I didn't go quite that far.
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