Real IP in header for SMTP Nginx Mail Proxy

[Maxim Dounin]

Hello!

On Fri, Jan 20, 2017 at 08:09:35AM +0100, Michael Brunner wrote:

> 
> Hi
> 
> I used the instruction below to build a mail proxy server with nginx:
> 
> https://www.nginx.com/resources/admin-guide/mail-proxy/
> 
> I configured it for IMAP, POP3 and SMTP. 
> 
> It's working quite well but I don't see the real IP of the sender in the mail header. When a user is sending a mail via SMTP, I see only the following in the mail header:
> 
> X-Sender-Id: _forwarded-from|46.xxx.xx.xx
> 
> For me it's important to see the real IP of the sender in the mail header, otherwise our outgoing spam filter will not like this solution.
> 
> How can I add the real IP of the sender to the mail header?

You can pass the client IP address to the SMTP backend using the 
"xclient" directive, see http://nginx.org/r/xclient.

-- 
Maxim Dounin
http://nginx.org/