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Postfix

Installing your SSL Certificate / Web Server Certificate / Secure Server Certificate from RapidSSL.com

Firstly when your issuance email arrives you will find your server certificate within the body of the email.

Copy your web server certificate into a text editor such as notepad and save as yourdomain.crt.

1. Locate and open the Postfix config file main.cf.

2. Save yourdomain.crt to the same directory as the yourdomain.key file which would have been created when you originally created your CSR. If you are importing an existing certificate, ensure you also import the yourdomain.key file.

3. In the the Postfix TLS settings section ensure the following directives and file locations are present. You will need to add them if they are not present or if they are different:

smtpd_tls_cert_file = /some/path/yourdomain.crt
smtpd_tls_key_file = /some/path/yourdomain.key

The following settings may be different per server, however ensure that your setup is similar to the below examples:

smtpd_use_tls = yes
smtpd_tls_auth_only = yes
smtpd_tls_session_cache_timeout = 3600s