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

itemprop="text">


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 ( href="https://network-tools.webwiz.net/reverse-dns.htm" rel="nofollow
noreferrer">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



class="post-text" itemprop="text">
class="normal">Answer



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



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