> On Sep 29, 2016, at 2:55 PM, Wietse Venema <[email protected]> wrote:
>
> Did you make changes to TLS ciphers and protocols settings?
>
> $ postconf -n | egrep 'tls.+(cipher|protocol)'
>
> BTW Postfix does not implement TLS, that's done in the OpenSSL
> library. If you run Postfix with a very old OpenSSL version then
> you may suffer from compatibility issues.
The OP should also note that the "network_biopair_interop" code
was last seen in Postfix 2.7, and has been removed in Postfix
2.8 and later. The oldest still supported (upstream by Wietse)
version of Postfix is Postfix 2.10. So whatever is logging
"network_biopair_interop" issues is rather dated on the Postfix
front, and though that's still likely not the cause of the problem,
the rest of the system software stack is undoubtedly similarly out
of date...
--
Viktor.
