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.