Re: [courier-users] Remove Received headers in outgoing authed email?

[Sam V. <mr...@co...>]

Jeff Potter writes:

>
> Hi List,
>
> How do we remove the initial Received header in outgoing email from our  
> servers, or at least mask out the IP address of our sending user?
>
> We have an instance of smtpd running specifically for authenticated users  
> (AUTH_REQUIRED=1). I looked through mailing lists; no luck; and I tried  
> TCPDOPTS="-nodnslookup -noidentlookup”, but also no luck.

There is no built-in switch to turn this off, but looking around the config  
files, there might be a way to hack the startup scripts.

In the esmtpd configuration file, replace

PORT="25"

with something like this

PORT="25 /usr/bin/env TCPREMOTEIP=127.0.0.1 TCPREMOTEHOST=localhost"

This might work in your specific situation only – a dedicated outbound-only  
server that requires authentication.

$PORT is passed to couriertcpd, right before the path to the courieresmtpd  
executable. This should make the startup script execute env, which will  
clear out the environment variables before invoking courieresmtpd.