Mail Proxy for two domains nehind NAT

[Maxim Dounin]

Hello!

On Sun, Feb 11, 2018 at 08:57:04PM -0500, entpneur wrote:

> Hello,
> 
> I tried to setup NGiNX as a Mail Proxy for two domains behind NAT.  Users
> will be diverted to the right server base on domain (eg./ user at domainA.com
> will be diverted to Server A and user at domainB.com will be diverted to Server
> B).
> 
> When I test the nginx.conf it gives me the following:
> 
> "nginx: [emerg] duplicate "0.0.0.0:143" address and port pair ..."
> 
> After some digging, I know that the listen directive need to have different
> address:port pair but reuseport option is not allow in mail context. 
> 
> Is there a way to overcome or achieve that?  Please Help!  TIA!

If you want to distinguish different clients based on what they 
provide during authentication, you have to use single server{} block 
for this, and then introduce required distinction at 
authentication level in your auth_http script.

-- 
Maxim Dounin
http://mdounin.ru/