TCP proxy with SNI support

[lukastribus]

This will not work, in short: SNI can only be used in protocols that implicitly use SSL (like HTTPS), not in protocols with explicit SSL via STARTTLS:

Please see the following thread for more details:

SMTP & IMAP proxy based on domain (pass-through)

Hello, My scenario is as follows: I have a single server with multiple domains. For each domain I’d like to have a separate docker container (won’t go into reasons why I want this, but it does make sense) as an email server (postfix + dovecot). I’ve researched this extensively for months and believe this should be possible using haproxy. I’d like to achieve this without ssl termination - basically using pass-though or in other words, read the TLS SNI header (domain) and decide based on that w…