On Mon, Jun 17, 2024 at 09:54:01AM +0800, Jeff Peng via Postfix-users wrote:

> smtp_use_tls = yes

Obsolete, ignored when the preferred form below is specified.

> smtp_tls_security_level = may

Keep this one.

> smtpd_use_tls = yes

Obsolete, ignored when the preferred form below is specified.

> smtpd_tls_security_level = may

Keep this one.

> my questions include:
> 
> 1. are "smtp_use_tls" and "smtp_tls_security_level" really needed?

Yes, for the latter.

> 2. shall "smtp_tls_session_cache_database" and
> "smtpd_tls_session_cache_database" use a explicit database? or can i just
> comment them out?

You typically only need the client-side cache, the server-side cache is
no longer needed since the introduction of TLS session tickets.

-- 
    Viktor.
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