On Fri, May 07, 2021 at 01:42:52AM +0200, Markus Julen wrote:
> Hi all!
> Having just moved a small "outgoing only" mailserver to 6.9, I started to 
> receive error messages:
> > 80008bb60b9428ed smtp connected address=X.X.X.X host=z.z.z
> > 80008bb60b9428ed smtp disconnected reason="io-error: handshake failed: 
> > error:1402610B:SSL routines:ACCEPT_SR_CLNT_HELLO:wrong version number"
> No filters, nothing, just plain smtpd. 6.8 worked flawlessly.
> Has anyone managed to tweak the "cipher" option to the "listen" directive? 
> Any other options to try?
> Telling everyone to upgrade their mail client is probably no option as of 
> now...


Have a look at the tls_config_set_protocols(3) manpage for the protocols and 
options. You can try with something like:

listen on ... tls protocols "legacy" ciphers "compat"


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