How to Set Up DKIM on GoDaddy
Some DNS providers may create DNS records with a duplicate the domain name, causing "mailpoet1._domainkey.example.com" record to be incorrectly created as "mailpoet1._domainkey.example.com.example.com". This is the case of GoDaddy, for example.
If that's the case, you'll see the records showing as "Invalid" on your MailPoet account.
To confirm this is what's happening, you can use the online tool https://www.mail-tester.com/spf-dkim-check
Duplicate the domain like this and check if you find a record for it:
In this case, please remove the domain name from the record's name, leaving it as " mailpoet1._domainkey", "mailpoet2._domainkey" and "_mailpoet".