Hi guys

We've recently had a site exploited and the server used to send out a ton of spam. Code had been injected into a bunch of php files.

I am now rebuilding from clean however we have sites installed that need to send out email on occasion.

Is it possible to set postfix to only send email when it has been created by a specific script or file on the server, for example, the file located in

/home/www/websiteexample.com/htdocs/path/to/Sendmail.php

or should I be looking at an alternative method of sending out email, and if so, what would you suggest.

Thanks in advance

If code has been injected into a bunch of php files (i.e. "at will"), what do you hope to accomplish by allowing only this particular file? I suppose you could configure Postfix to require authentication and then build auth into your sendmail.php script. Else maybe also config Postfix to listen on some obscure and/or high port and only allow connections from localhost. But, again, if arbitrary code is being injected into a bunches of php files, there's not much to stop them from also injecting a port scanner tool. So all you can really do is raise the bar a bit and hope the kiddies go somewhere else where it's lower.

Well from what I've seen so far with the files that have been exploited or created is that the newly created files have random looking names, ie, w40688301n.php, and injected code is mostly limited to the top level of the domain, ie index.php. While my rebuild of the server and update to the software 'should' close these holes, as both the server and the software install was somewhat outdated, I was hoping I could further secure postfix by allowing only my said scripts to generate emails. Sort of like a whitelist. The problem is that the sendmail.php file is not my own, so any changes I make to it could easily get update during future updates to the site software.