apt update && apt upgrade -y

apt -y install dovecot-core dovecot-pop3d dovecot-imapd

vi /etc/dovecot/dovecot.conf

line 30 : uncomment

listen = *, ::

vi /etc/dovecot/conf.d/10-auth.conf

line 10 : uncomment and change (allow plain text auth)

disable_plaintext_auth = no

line 100 : add

auth_mechanisms = plain login

root@mail:~# vi /etc/dovecot/conf.d/10-mail.conf

line 30 : change to Maildir

mail_location = maildir:~/Maildir

vi /etc/dovecot/conf.d/10-master.conf

line 107-109 : uncomment and add

Postfix smtp-auth

unix_listener /var/spool/postfix/private/auth { mode = 0666 user = postfix group = postfix }

systemctl restart dovecot ... https://www.youtube.com/watch?v=D28WztYQk9w