https://www.vultr.com/docs/how-to-insta ... untu-20-04
$ sudo apt update
$ sudo DEBIAN_PRIORITY=low apt install postfix
$ sudo dpkg-reconfigure postfix
$ sudo apt install dovecot-imapd dovecot-pop3d dovecot-core
$ sudo apt install mutt
$ sudo ufw allow Postfix
$ sudo ufw allow 110,143,993,995/tcp
$ sudo nano /etc/dovecot/dovecot.conf
protocols = imap pop3
$ sudo postconf mail_spool_directory
mail_spool_directory = /var/mail
$ sudo nano /etc/dovecot/conf.d/10-mail.conf
mail_location = maildir:~/Maildir
mail_privileged_group = mail
$ sudo adduser dovecot mail
$ sudo nano /etc/dovecot/conf.d/10-auth.conf
disable_plaintext_auth = yes
auth_username_format = %n
auth_mechanisms = plain login
$ sudo nano /etc/dovecot/conf.d/10-ssl.conf
$ sudo nano /etc/dovecot/conf.d/10-master.conf
service auth {
unix_listener /var/spool/postfix/private/auth {
mode = 0660
user = postfix
group = postfix
}
}
$ sudo nano /etc/dovecot/conf.d/15-mailboxes.conf
auto = create
mailbox Trash {
auto = create
special_use = \Trash
}
$ sudo systemctl restart dovecot
$ sudo ss -lnpt | grep dovecot
$ sudo systemctl status dovecot
$ sudo systemctl restart postfix