I have followed the instructions for DKIM and published the 4 records.
As you know, one of the records instructed to publish does not end in “_domainkey”. it is simply “fddkim” which resolves to “spfmx1.domainkey.freshemail.io”.
That fddkim dkim key always fails and I assume it is because the string _domainkey is a fixed part of the specification.
I have tried to add it to my DNS provider both ways (with and without “_domainkey”), and it always fails.
What is recommendation? It would seem that you are recommending that we publish a record that violates the DKIM standard.
Thank You