On 5/9/2013 5:28 AM, Reindl Harald wrote: > > > Am 09.05.2013 12:24, schrieb Héctor Moreno Blanco: >> I would like to reject an email if the MX does not exist. We have enable the >> setting /reject_unknown_sender_domain/ >> and /reject_unknown_recipient_domain/. However, if the domain has DNS and >> resolves it, the message is sent, and we >> don’t want that > > this is a completly broken idea
Not completely broken. It's not really "no MX" that Hector is after, but undeliverable sender addresses in snowshoe spam. "No MX" would fall under this umbrella. Hector, I think what you're looking for is Sender Address Verification, or SAV. This is implemented in Postfix as reject_unverified_sender. See: http://www.postfix.org/postconf.5.html#reject_unverified_sender http://www.postfix.org/ADDRESS_VERIFICATION_README.html Read the ADDRESS_VERIFICATION_README at least twice, or more times, until you fully understand it. There are serious caveats to using SAV. -- Stan
