smtp_use_tls, which enables (or disables) transport layer security. Still, if you need to exclude certain ciphers or protocols for opportunistic (STARTTLS) or mandatory (regular SSL) encryption, use the following directives in /etc/postfix/main.cf and assign the corresponding values to them: Transport Layer Security (TLS) should be used to encrypt the authentication process. This is not an actual security question. To configure Postfix for SMTP-AUTH using SASL (Dovecot SASL), run these commands at a terminal prompt: To install postfix in Debian from official repositories execute the following command. How To Configure Postfix. Test SMTP Auth Using a Standard Mail Client. /var/log/maillog:Apr 14 13:03:25 tao postfix/smtp[35454]: Trusted TLS connection established to gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1a]:25: TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits) /var/log/maillog.2.bz2:Apr 11 16:35:39 tao postfix/smtpd[95371]: Anonymous TLS connection established from mail-oa0-x247.google.com[2607:f8b0:4003:c02::247]: … On Postfix the smtpd_tls_ciphers parameter controls the minimum cipher grade and is set to medium level by default, which is sufficient enough for providing robust security. smtp_sasl_security_options , which in the following configuration will be set to empty, to ensure that no Gmail-incompatible security options are used. 8. Once authenticated the SMTP server will allow the client to relay mail. Using telnet or openssl is a great way to test and debug connection issues. Once authenticated, the server will allow the client to … Start sasl: service saslauthd start smtp_sasl_auth_enable , which enables (or disables) SASL authentication. During the installation process of Postfix you will be asked a series of questions. We use Sendgrid for sending mails in most of our web applications, so I’ll use their SMTP server as an example. Just remember to run the service postfix reload or service postfix restart command every time you change the Postfix configuration files. I found three that look promising in the top few results, but they do not explicitly claim to test enforcement of TLS… Next, you should enable SMTP-AUTH, which allows a client to identify itself through the authentication mechanism SASL. If TLS is not working, SMTP auth will also not work because this howto forces postfix to use TLS when doing SMTP auth. First we need to edit /etc/postfix/main.cf, the default configuration file: nano /etc/postfix/main.cf. If you do not see ‘Ready to start TLS’, something is wrong with your TLS setup.


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