Am 09.05.2013 14:14, schrieb Stan Hoeppner: > 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
if you have a A-record for "example.com" and you incoming mail-server is on this IP you do not need any MX record and postfix will happily use the A-record to deliver mail another story is if there is a MX-Record but the listed hostname does not resolve and at least for me the intention of "if the MX does not exist" is not clear enough if it means a) no MX record for the domain b) a MX record with a non-resloving hostname reject b) would be fine reject a) would be stupid
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