The mail doesn’t even reach Postfix queue as I cannot connect to send. I do have a awesome connection receiving my mail though ☺
This sounds to me like you have an error i n your submission, either the certs are not correct, or there is a configuration issue in postfix. Either way, it is unlikely to be a dovecot error as dovecot doesn't send mail.
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My main job is trying to come up with new and innovative and effective ways to reject even more mail. I'm up to about 97% now.