Ubuntu 20.04 LTS : SSL/TLS (Postfix & Dovecot)
Mail Server : SSL/TLS Setting2020/05/19 Configure SSL/TLS to use encrypted connections.SMTP-Submission uses [587/TCP] (used STARTTLS), SMTPS uses [465/TCP], POP3S uses [995/TCP], IMAPS uses [993/TCP]. [1] Get SSL certificates, refer…