this 550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR records 550-5.7.1 and authentication
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This is the mail system at host mail.tianex.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<exxx@gmail.com>: host gmail-smtp-in.l.google.com[2607:f8b0:4002:c11::1a]
said: 550-5.7.1 [2600:3c02::f03c:91ff:fe50:2897] Our system has detected
that this 550-5.7.1 message does not meet IPv6 sending guidelines regarding
PTR records 550-5.7.1 and authentication. Please review 550-5.7.1
https://support.google.com/mail/?p=IPv6AuthError for more information 550
5.7.1 . f11-20020a25bd0b000000b0066ebca3ab2bsi17522906ybk.146 - gsmtp (in
reply to end of DATA command)
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