Create both IPv4 and IPv6 SPF record [closed]

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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 info@dadilja.rs does not designate 2a01:4f8:d16:1355::2 as permitted sender) client-ip=2a01:4f8:d16:1355::2;

Answer 1

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"

Answer 2

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.