[pfx] Re: postfix "system library:BIO_connect:Connection refused" following Debian Bookworm update

[Laura Smith via Postfix-users]

> Perhaps Postfix does not "listen" on the IPv6 address? You can use nc or lsof
> to find out.
> 

See above where I said "worked fine before the update".  "Worked fine" includes 
external validation, i.e. direct email delivery and ipv6 test websites such as 
internet.nl

For the records, I *think* I found the fix, its probably some sort of parsing 
change in Postfix because I changed these lines from my "previously working" 
config :

smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1
smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1

To:

smtpd_tls_mandatory_protocols = >=TLSv1.2, <=TLSv1.3
smtpd_tls_protocols = >=TLSv1, <=TLSv1.3

And then the IPv6 tests started working again.
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