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Recently there has been a spate of spam coming in to my server using local domains in the from. For instance, a customer of mine, (ie; localhardwarestore.com) is receiving several dozen emails From: email@example.com -- an email address that does not exist. I have the same problem on one of my own domains. Dozens per day. Especially of the "Your invoice" variety containing bad, bad attachments.
Can SM be modified to recognize local domains and do a check to see if the From: account exists, and if not, treat it as spam? Seems pretty simple.
All email servers should work like this, but of course that would be a massive performance hit.
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