Does anyone know of any courierfilter implementations (or even C programs) that do dialback verification? (That is, given an email address, connect to the given domain's MX and verify that the server will accept email destined to the address in question?)
I know Gordon has written something in Python but had unresolvable issues with it. I'm seeing a definite increase in the number of junk messages with bad from addresses bouncing into my postmaster account (because some of our users have forwards to other servers that have dialback), and would love to cut them off at the knees.
best, Jeff
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