wh...@hushmail.com:
> Aug 31 21:38:14 johndoe postfix/smtpd[16200]:
> s097.networking4all.com[213.249.64.242]: TLS cipher list
> "ALL:!EXPORT:!LOW:!MEDIUM:+RC4:@STRENGTH"
...
> smtpd_tls_security_level = may
> smtpd_tls_mandatory_ciphers = medium
> smtp_tls_protocols = !SSLv2, !SSLv3

Comment out all your smtpd_tls lines (including the lines that you
did not show) until the output from the command "postconf -n" shows
only these four:

smtpd_tls_CAfile
smtpd_tls_cert_file
smtpd_tls_key_file
smtpd_tls_security_level

Then add back your tweaks one by one (executing the command "postfix
reload" after each change) and learn which change breaks inter-operability.

You may also find some helpful hints in www.postfix.org/TLS_README.html.

        Wietse

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