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clarkk
Asked: 2019-09-29 13:46:03 +0800 CST

SPF and IPv6 fails even if the reverse DNS is created

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When sending mails to Gmail I get this error

Received-SPF: fail (google.com: domain of [email protected] 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

SPF record

v=spf1 a mx -all

DNS records

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

1 Answers

  1. Best Answer

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

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