If I am sending mail through SMTP, I understand that it is IONOS who signs those emails, right?
I would like to add the DKIM header to my emails. I know that it is necessary to publish a CNAME record with the public key but if I don't use a third-party service, I understand that it is ionos who must have that private key and therefore offer me the public key.
If ionos does not offer me the public key, what do I do? Since IONOS is in charge of signing the mail with the private key and adding the DKIM header, if they don't give me a public key, what is the solution or is something wrong with the approach?
Has anyone got something similar? Should I send an email to IONOS requesting the public key?