On Fri, May 09, 2025 at 10:18:19AM +1000, Carl Brewer via Postfix-users wrote:

> I changed it to this :
> 
> smtpd_tls_security_level = may
> smtpd_tls_cert_file = 
> /usr/local/etc/letsencrypt/live/rollcage13.aboc.net.au/fullchain.pem
> smtpd_tls_key_file = 
> /usr/local/etc/letsencrypt/live/rollcage13.aboc.net.au/privkey.pem

You've arrived at the correct setting before I had a chance to suggest it.

> It seems to be working, but the test on
>  https://ssl-tools.net/mailservers/rollcage13.aboc.net.au
> Is still moaning about an authority.

If the test is unhappy, the problem is with the test.
I can confirm that your setup is fine both and without
an SNI hostname signal (TLS extension):

    $ posttls-finger -clsecure -Lsummary -s rollcage13.aboc.net.au \
        -F /etc/ssl/cert.pem "[rollcage13.aboc.net.au]"
    posttls-finger: Verified TLS connection established
        to rollcage13.aboc.net.au[203.6.241.36]:25:
        TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
        key-exchange x25519 server-signature RSA-PSS (2048 bits)
        server-digest SHA256

    $ posttls-finger -clsecure -Lsummary \
        -F /etc/ssl/cert.pem "[rollcage13.aboc.net.au]"
    posttls-finger: Verified TLS connection established
        to rollcage13.aboc.net.au[203.6.241.36]:25:
        TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
        key-exchange x25519 server-signature RSA-PSS (2048 bits)
        server-digest SHA256

-- 
    Viktor.
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