Does this SPF record still work?
Read a domain's SPF record and say what is wrong with it: the ten-lookup limit, +all, terms after all, more than one record. Or build one.
Step 1
Enter the domain your mail comes from.
Step 2
We read its published SPF record.
Step 3
You get the DNS-lookup count and everything that would stop it working.
The ten-lookup limit
SPF allows ten DNS-lookup mechanisms — include, a, mx, ptr, exists, redirect. Past ten, receivers stop evaluating and return permerror, and the record stops working entirely.
The trap is that each include also spends the lookups inside it. A provider adding one mechanism to their own record can push you over the limit without you changing anything, and nothing will tell you.