I have a bunch of domains widespread over various DNS providers today, and all of them looks like this:
@ TXT "v=spf1 a:spf.example.com -all"
Which is good for now. However, I want to add a additional allowed outgoing servers. Normally I'd go with changing the a to include and use TXT/SPF records instead, but since they are spread among a lot of providers, this would be a very cumbersome task.
So, the big question is:
When adding multiple equal A records e.g.:
spf.example.com A 220.127.116.11 spf.example.com A 18.104.22.168
how would SPF react to that?
Would it only allow the first entry it gets in the response from DNS or would it accept all the A records for the same hostname?