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Using verify receivers sounds good. My internal email server is qmail on FreeBSD. Perhaps qmail is configured to reject unknown users by default as seems to be required as discussed in the Deployment Guide for Exchange. Before I test, hopefully you might have a suggestion how I might fix...

Hi, We have the same problem, but less luck finding the right configuration to solve it. We receive thousands of backscatter bounces everyday from spam forged as if it was sent from one of our few domains. It would be very desirable to dump or block these messages before they are...