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I would like to add a second SPF TXT record to my domain, allowing an external mail-server to send emails from my domain so it won't be classified as spam on the receiving end. I've read that I should not create two separate TXT records, but combine them into one.
There's currently a mail-server running on my domain as well, and it has this TXT record:
v=spf1 +a +mx -all
The one that I have to add to allow the external server is:
v=spf1 a mx include:spf.externaldomain.com ~all
I've found related questions on how to combine two records with two
include:'s, but as my existing record has a
+a +mx and
-all, and the second one
a mx and
~all, I'm not sure how to combine them. Obviously, I still want the record for my mail-server on my domain give the correct SPF replies as well.