On Sep 17, 2003, at 2:59 PM, Matthew Bramble wrote:
False positives will come from users that misspell their domain name in their mail client. I have had that happen. There are also lots of forms being used on Web sites that take the user's input and construct a message using their address as the From in order to facilitate replies, and I can tell you from experience that lots of these people screw up (especially AOL users). I'm not sure if blocking on this one test is advisable in that instance, probably more so depends on your user base and whether you think it's appropriate to block mail from people that make mistakes in spelling, but otherwise don't have problems. I think HELOBOGUS also picks up on the misspellings (too busy to verify at the moment).
Because of this, I'm playing it conservatively for the time being. Same goes for MAILFROM.
What if I use the BOUNCE action on that one test and give the test a small weight so it contributes a little towards spam filtering, but it always BOUNCEs so you get an error?
Trying to think of the best for users and for catching.
-Josh
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