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email - SPF and IPv6 fails even if the reverse DNS is created




When sending mails to Gmail I get this error




Received-SPF: fail (google.com: domain of test@domain.com does not
designate 2a01:4f8:xxx::2 as permitted sender)
client-ip=2a01:4f8:xxx::2;




When I test the IPv6 2a01:4f8:xxx::2 reverse DNS (https://network-tools.webwiz.net/reverse-dns.htm) it maps to the correct host smtp.domain.com






v=spf1 a mx -all





  • A record smtp targeting the IPv4 88.133.xxx.xxx

  • MX record targeting smtp



Answer



Looks like you lack an AAAA record for smtp with content 2a01:4f8:xxx::2.


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