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Accepted Answer
Okay, so I finally figured it out. For anyone else who wants it:
@stevenhost am not able to follow through,
How did you set FQDN of email.mydomain.tld?
@stevenhost I did finally just Google it and set it properly.
Though I found out I needed Dovecot, Postfix, plus Rainloop. And I had missed the first two.
So I had Rainloop working, but could create users email accounts.