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I am configuring a postfix server (Version 3.3.1 on CentOS 8)

If I configure both, smtpd_tls_CAfile and smtpd_tls_CApath, will postfix load all the certificates or will it choose one of the options over the other?

I can't tell from the documentation here: http://www.postfix.org/postconf.5.html#smtp_tls_CApath

Back in the bad old days, some operating systems would ship trusted CA certificates in separate files, all placed in some directory. This is the directory you would use with smtpd_tls_CApath.

This far into the 21st century virtually all Linux distributions ship a pre-built single file containing every trusted CA certificate. Its location varies by Linux distribution, but wherever it is placed, it is the file name you would use with smtpd_tls_CAfile.

These options are mutually exclusive. You will only use one of them, depending on how your operating system ships its trusted CA certificates. Most likely it will be smtpd_tls_CAfile. On CentOS 8, the CA certificate bundle is located at /etc/pki/tls/certs/ca-bundle.crt, giving you the main.cf configuration:

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