[exim] Proxy smtp connections to multiple Exim servers behin…

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Συντάκτης: Sebastian Arcus
Ημερομηνία:  
Προς: Exim Users
Αντικείμενο: [exim] Proxy smtp connections to multiple Exim servers behind proxy
I have a number of Exim servers behind a NAT gateway (actually connected
with vpn's to a cloud vps - but I'm hoping this is not relevant to this
post). I would like the gateway to send incoming port 25 traffic to the
correct Exim server based on SNI in incoming TLS packets - as different
Exim instances serve different email domains. The setup would look like
this:

                       [Internet]
                           |
                           |
                     (smtp port 25)
                           |
                           v
                           |
                    [Cloud server]
                           |
                           v
                           |
        ----------------------------------------
        |                  |                   |
        |                  |                   |
[Exim server 1]    [Exim server 2]    [Exim server 3]



I would have preferred to do this at IP tables level - but apparently
not really possible. It seems the next option would be HAProxy. Has
anyone here used HAProxy or run a setup as above, or know if this is
actually doable? Any suggestions much appreciated.