Mail Server : SSL/TLS Setting2023/07/07 |
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]. |
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[1] | |
[2] | Configure Postfix and Dovecot. |
root@mail:~#
vi /etc/postfix/main.cf # add to last line smtpd_tls_security_level = may smtp_tls_mandatory_protocols = !SSLv2, !SSLv3 smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3 smtpd_tls_cert_file = /etc/letsencrypt/live/mail.srv.world/fullchain.pem smtpd_tls_key_file = /etc/letsencrypt/live/mail.srv.world/privkey.pem smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
root@mail:~#
vi /etc/postfix/master.cf # line 19, 20, 22 : uncomment submission inet n - y - - smtpd -o syslog_name=postfix/submission # -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes # add to last line if you enable smpts smtps inet n - y - - smtpd -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes
root@mail:~#
vi /etc/dovecot/conf.d/10-ssl.conf # line 6 : change ssl = yes
# line 12,13 : uncomment and specify certificates ssl_cert = < /etc/letsencrypt/live/mail.srv.world/fullchain.pem ssl_key = < /etc/letsencrypt/live/mail.srv.world/privkey.pem
systemctl restart postfix dovecot |
[3] | For Client's settings, ( Mozilla Thunderbird ) Open account's property and move to [Server Settings] on the left pane, then Select [STARTTLS] or [SSL/TLS] on [Connection security] field on the right pane. |
[4] | Move to [Outgoing Server] on the left pane, then Select [STARTTLS] or [SSL/TLS] on [Connection security] field. Furthermore, change port to the used port. ([STARTTLS] uses [587], [SSL/TLS] uses 465.) |
[5] | Verify possible to send or receive Emails normally. |
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