On 05-19-2021 4:07 pm, Viktor Dukhovni wrote:
The correct solution is to NOT terminate TLS on haproxy, and do TLS
end-to-end from client to Postfix, with haproxy only handling layer 4
TCP.

This is what i originally tried before email the list. With this kind of setup thunderbird reported:

   Sending of message failed.
Unable to communicate securely with peer: requested domain name does not match the server's certificate.

Postfix logs reported:

warning: TLS library problem: error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert
   bad certificate:ssl/record/rec_layer_s3.c:1544:SSL alert number 42:

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