June 2025
Beginner to intermediate
1180 pages
37h 48m
English
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26.3 Postfix Encryption (TLS/STARTTLS)
Postfix supports the TLS protocol and the STARTTLS method for establishing an encrypted connection between itself and the mail client that wants to send an email. However, this assumes that main.cf is configured accordingly and that you have a suitable certificate for your machine. Basic knowledge about “correct” and self-generated certificates can be found in Chapter 24, Section 24.2. For more information about Postfix TLS support, visit https://www.postfix.org/TLS_README.html.
Note that changes to the TLS configuration will only take effect after a restart of Postfix!
smtpd = Incoming, smtp = Outgoing
When configuring TLS in main.cf, there are two groups of parameters you must not confuse. In one ...
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