I just did a verification on my instance and it can send emails as such (already the initial user-registration requires that to work).
Not sure how you triggered
Nov 19 13:45:54 2019/11/19 13:45:54 [ERROR] smtp_owner_reset_hex.go:19 smtpOwnerResetHex(): cannot send reset email: gomail: could not send email 1: gomail: invalid address "=?UTF-8?q?XXXXXXXXXXXX<post@XXXXXXX.XX>?=": mail: expected single address, got "?="
But something does look odd with that email address. Does the address by any chance contain special characters, which may break something in commento?