I really don't want to sound rude, please believe me, it's just the last answer in the comments of the tutorial I have register a help request in, has more than a year and there are many questions after that without answers... so, is it possible the answer to my request will never come?
Thanks!

--- Tutorial: https://www.digitalocean.com/community/tutorials/how-to-set-up-a-postfix-e-mail-server-with-dovecot
--- User: alecfunes