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Aug. 25th, 2015|04:53 pm |
A mail exchanger record (MX record) is a type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages...
postfix: reject_unknown_sender_domain Reject the request when MAIL FROM domain has 1) no DNS MX and no DNS A record, or 2) a malformed MX record such as a record with a zero-length MX hostname (Postfix version 2.3 and later). |
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