Решение с Gmail: meet IPv6 sending guidelines regarding PTR records

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SMTP error from remote mail server after end of data:
host gmail-smtp-in.l.google.com [2a00:1450:400c:c0a::1a]:
550-5.7.1 [2001:41d0:2:d22::] Our system has detected that this message does not
550-5.7.1 meet IPv6 sending guidelines regarding PTR records and authentication
550-5.7.1 . Please review
550-5.7.1  https://support.google.com/mail/?p=IPv6AuthError for more information
550 5.7.1 . 19si4009532wmt.10 - gsmtp

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Проблема эта возникает через то что Gmail'у надо чтобы была указана PTR запись на почтовый сервер.
Надо добавить PTR на А и АААА запись.