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Postfix - Recipient address rejected

Question asked by Matt Parfitt on Apr 3, 2018
Latest reply on Apr 9, 2018 by Thomas Werner

We are seeing a lot of email being rejected by postfix, some of which is legitimate email that should be delivered.


What I'm seeing from the maillog is logs such as the following;


NOQUEUE: reject: RCPT from unknown[Our IP Address]: 554 5.7.1 <Internal Email address>: Recipient address rejected: Access denied; from=<External Email Address> to=<Internal Email address> proto=ESMTP helo=<>


We are seeing this repeatedly for different external domains. However the majority of mail is coming through ok.


I've been reading about editing postfix to change the line smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination to permit_unauth_destination.


Please can someone explain what this will do and if it will solve my problem?