File containing CA certificates of root CAs trusted to sign either remote SMTP server certificates or intermediate CA certificates.Defaults to the system CA bundle that is managed through the <code>security.pki</code> options.<a href="https://www.postfix.org/postconf.5.html#smtp_tls_CAfile" rel="nofollow">https://www.postfix.org/postconf.5.html#smtp_tls_CAfile</a>.

services.postfix.settings.main.smtp_tls_CAfile

File containing CA certificates of root CAs trusted to sign either remote SMTP server certificates…