Extending on your idea, or maybe subtracting from it...doesn't most of the E-mail coming in that doesn't match a real address, get targeted at an address like postmaster, webmaster, root or admin? A filter could be set up for that and it could be scored high because you really shouldn't be receiving things like newsletter subscriptions receipts and other valid commercial E-mail on addresses like those (unless you are actually promoting their use). I personally have a big problem with this because I have so many postmaster aliases redirected at my personal account, and the stuff that goes to those addresses is the worst junk of all. I think I'm going to do this myself.

Of course there is even more benefit to what you suggested. I have customers that have set up rules to kill E-mail going to deleted accounts because their former owners had a knack for getting on every list in the world, and they got sick of the nobody alias redirecting what got through at them, and your recommendation would help out in cleaning up a portion of what got through. I love the idea and hope that it is easy to implement.

Matt

Charles Frolick wrote:

I'm trying to remember if this has been suggested before, couldn't seem
to find anything in the archives (probably bad search terms).  How about
a test similar to MAILFROM but it checks the intended recipients of all
local domains and fails if any of them are invailid, ignoring the nobody
alias.  It could even return the count as weight or a multiplier of
count as weight.  I can't think of a reason legitimate mail will have
more than a couple outside of a mailing list, which, if I'm remembering
right, generally only uses single recipients.

Pros, cons, extensions?

Thanks,
Chuck Frolick
ArgoNet, Inc.




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