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A/AAAA IPv6 Record in SPF

A/AAAA IPv6 Record in SPF

TL;DR In v=spf1 a mx ~all the a is for both A (IPv4) and AAAA (IPv6) RFC 7208 says: Designated sender mechanisms are used to identify a set of addresses as being permitted or not permitted to use the for sending mail. The designated sender mechanisms are as follows: a mx ptr (do not use) ip4 ip6 exists {snip} When any mechanism fetches host addresses to compare with , when is an IPv4, “A” records are fetched; when is an…

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