sudo apt install dovecot-imapd dovecot-pop3d

A. 10-auth.conf : 접속권한

auth_mechanisms = plain login
disable_plaintext_auth = yes

B. 10-mail : 메일 전반

mail_location = maildir:~/Maildir

C. 10-master : dovecot 전반

service pop3-login{
  inet_listener po3{
    port = 110
  }

  inet_listener pop3s {
    port = 995
    ssl = yes
  }
}

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

D. 10-ssl.conf : SSL 설정

ssl = yes
ssl_cert = </etc/letsencrypt/live/domain/fullchain.pem
ssl_key = </etc/letsencrypt/live/domain/privkey.pem

E. 20-pop3 : pop3 전반

pop3_uidl_format = %08Xu%08Xv
 
dovecot 적용 = sudo systemctl restart postfix.service