Another nice feature, and simpler in fact would be to "validate" the sender server, so if the email is incoming (not from an authenticated local user), imail would make a search for the DNS of the domain, and if the server is in the list of MX, then fine, but if the server is not, then TAG/BOUNCE/DEL/WHATEVER....
Any idea if this is done by other mail servers?
We implemented that in Declude JunkMail a few years ago. However, it is not recommended to block such E-mail, as a lot of organizations have gateways that they send their mail through. It does, however, help prevent legitimate E-mail from getting blocked (since a very high percentage of E-mail that comes from an IP in the MX record is legitimate).
-Scott
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