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Right now I have SPF IP4 and IP6 as two separate records, but IPv6 is not being recognized by Gmail. Should I merge them? It looks like this currently. How should it be configured?
A 3600 0 78.46.138.249 MX 3600 10 mx.zohomail.com MX 3600 20 mx2.zohomail.com NS 3600 0 ns1.loopia.se NS 3600 0 ns2.loopia.se TXT 3600 0 "v=spf1 ip4:78.46.138.249 ~all" TXT 300 0 "v=spf1 ip6:2a01:4f8:d16:1355::2 +all" GMail:
Received-SPF: softfail (google.com: domain of transitioning [email protected] does not designate 2a01:4f8:d16:1355::2 as permitted sender) client-ip=2a01:4f8:d16:1355::2; 
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Don't use multiple SPF records! A domain name MUST NOT have multiple records that would cause an authorization check to select more than one record. The rule of thumb: multiple SPF records will fail the SPF authentication.
The SPF record Checker has found an SPF record; Your SPF record doesn't exceed the maximum number of 10 lookups; The configured IP addresses are real addresses that are used to send email from.
The SPF version tag should be followed with all IP addresses that are authorized to send email on behalf of your domain. Next comes the “include” statement, which is needed for every third-party organization that sends email on your behalf.
I think this is a duplicate of Will adding a second SPF record mess up my DNS? on Server Fault.
In short: yes, you must merge them. The specs do not allow multiple SPF records.
The resultant merged record should be:
TXT "v=spf1 ip4:78.46.138.249 ip6:2a01:4f8:d16:1355::2 ~all" Yes it is possible and it works, a SPF with both ip6 & Ip4 would look like:
"v=spf1 ip4:XX.XX.XX.XX ip6:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX ~all" You can also in both cases add a CIDR (basis: /32 for ipv4 & /128 for ipv6) after each address to authorize a network range rather than a host.
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