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Our system has detected that this message 550-5.7.1 does not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. Please review 550-5.7.1

vim /etc/postfix/main.cf
inet_protocols = ipv4
service postfix restart

This entry was posted in linux and tagged postfix on April 11, 2020 by Vitalijus Ryzakovas.

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