php - Mails bounce due to Google IPv6 standards -

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i using mail() function in php in order send mails using smtp , noticed not getting lot of mails suppose get.

a quick view @ /var/log/maillog in server have shown lot of emails getting bounced message: "our system has detected message not meet ipv6 sending guidelines regarding records , authentication. please review https://support.google.com/mail/?p=ipv6_authentication_error more information"

is there standard mailing process should follow satisfy google?

this example of 1 of mails fail most of times:

mail('my_email_goes_here', 'some title', 'my html message, including html tags such <ul> , <li>',                     'mime-version: 1.0\r\n content-type: text/html; charset=utf-8\r\n');

for record, of emails getting sent, majority bounce, maybe it's not structure of mail content?

a few month ago, had same problem. response google didnt much, means: "there wrong, find out whats problem". have check google guidelines , see if meet them. problem didnt had reserve dns entry mail server. google pings ip of sedning server , check if reserve entry returns correct domain. if not case, error can occur. in case problem to.


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