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SSL Setting
2017/07/23 |
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Configure SSL to encrypt connections.
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| [2] | Configure Postfix and Dovecot for SSL. |
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[root@mail ~]#
vi /etc/postfix/main.cf # add to the end smtpd_use_tls = yes
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3 smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3 smtpd_tls_cert_file = /etc/pki/tls/certs/server.crt smtpd_tls_key_file = /etc/pki/tls/certs/server.key smtpd_tls_session_cache_database = btree:/etc/postfix/smtpd_scache
[root@mail ~]#
vi /etc/postfix/master.cf # line 29-31: uncomment smtps inet n - n - - smtpd -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes
[root@mail ~]#
vi /etc/dovecot/conf.d/10-ssl.conf # line 8: change ssl = yes
# line 14,15: specify certificates ssl_cert = < /etc/pki/tls/certs/server.crt ssl_key = < /etc/pki/tls/certs/server.key
# line 51: uncomment ssl_protocols = !SSLv3 systemctl restart postfix dovecot
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| [3] | If Firewalld is running, allow SMTPS/POP3S/IMAPS services. SMTPS uses 465/TCP, POP3S uses 995/TCP, IMAPS uses 993/TCP. |
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[root@mail ~]# firewall-cmd --add-service={smtps,pop3s,imaps} --permanent success [root@mail ~]# firewall-cmd --reload success |
| [4] | For Client's settings, ( Mozilla Thunderbird ) Open account's property and move to [Server Settings] on the left pane, then Select [SSL/TLS] on [Connection security] field on the right pane. |
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| [5] | Move to [Outgoing Server] on the left pane, then Select [SSL/TLS] on [Connection security] field. Furthermore, change port to [465] like follows. |
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| [6] | If your own self-signed certificates, the warning like follows are displayed, but it's no ploblem to proceed. Then it's possible to send or receive emails through SSL/TLS connection. |
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