Is this possible? Like a wildcard TXT record of some sort?


Yes, it is possible to define a wildcard TXT record. Notice that you should define both a TXT RR and a SPF RR.

In my home I run a local DNS server with the .fbh domain extension, I have created this record:

*.email         IN  TXT "v=spf1 mx -all exp=bad.example.com"

And this gives me the same response for all queries to *.email.fbh:

$ dig +short TXT test.email.fbh
"v=spf1 mx -all exp=bad.example.com"

$ dig +short TXT smth.email.fbh
"v=spf1 mx -all exp=bad.example.com"

You can, however, include a central spf record in the invidual subdomain spf records.

Each individual spf records for the subdomains could look like this:

v=spf1 include:_spf.domain.tld ~all

And then add a TXT record for _spf.domain.tld with the actual spf values:

v=spf1 ip4: ~all

This way, you only need to maintain _spf.domain.tld, and not the records for the individual subdomains

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