[CentOS] preventing apache from being a mail relay

Mon Mar 4 23:33:50 UTC 2013
Gordon Messmer <yinyang at eburg.com>

On 03/04/2013 03:04 PM, Les Mikesell wrote:
> I remember having a problem back in the RH (not RHEL) 5 or 6 era where
> I was using ProxyPass or rewriterules with [P} and it somehow enabled
> random proxy requests which I noticed when the logs filled up with
> requests that were intended to run up to run up some other sites ad
> counters.  It is too far back to remember if that was the default from
> the install or was related to what I did to enable the specific proxy
> functions I needed, though.

That would have been in the Apache 1.0 era.  If you enabled 
ProxyRequests and did not limit the Proxy command, you'd have created an 
open proxy.

Poorly written Rewrite rules have been problematic, even fairly recently:

However, none of this affects the default configuration.