Autor: Sebastian Arcus Data: A: exim-users Assumpte: Re: [exim] Proxy smtp connections to multiple Exim servers behind
proxy
On 15/04/2023 17:00, Fabio Martins wrote: > I believe you are trying to use the same IP address for the 3 exim
> instances, otherwise the solution would be quite simple binding each
> instance to the proper IP address. Right? Or do you have 3 different
> public IP addresses?
That's correct - there is only one IP address on the VPS/proxy - which
needs to serve all the Exim servers behind
>
> If you have only 1 public IP, does a solution forwarding to a subdomain
> via system_aliases+dsearch+local_parts+cron job updating user list,
> would satisfy?
>
> example:
>
> adam@??? -> adam@???
> eve@??? -> eve@???
> keyser@??? -> keyser@???
> soze@??? -> soze@???
> contact@??? -> contact@???
I can't say that I am really following what you are trying to suggest -
but I don't think having emails on subdomains would help with my problem
>
> --
>
> On 2023-04-15 11:53, Sebastian Arcus via Exim-users wrote:
>> 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.
