Hi Viktor, I am a novice linux user who has a plesk server, with postfix, that has never signed a DKIM signature to my outgoing mail. Everything is enabled for the domain, yet still no signing. I have tried resetting everything, restarting, and rebooting. I have checked for the existence of the DKIM key, it's there, but this dog just does not hunt for me. I'm so frustrated now that I would be willing to pay someone to fix this issue, can I interest you?
Kindly, Jon