IredMail POP3.IMAP.Connection.without.STARTTLS

Since iRedMail-0.8.0, all clients are forced to use IMAPS and POPS (via STARTTLS) for better security by default. If you want to enable POP3/IMAPS without STARTTLS, please update below two parameters in dovecot.conf and restart Dovecot service:

File: dovecot.conf

disable_plaintext_auth=no ssl=yes

Again, it's strongly recommended to use only POP3S/IMAPS for better security.