sendmail-wrapper for PHP

Years ago I wrote about the extensive sendmail wrapper with sender throttling, a pretty simple Perl script. It reliably provided throttling of the email volume per day by the sender’s original UID (user id). It also logged the pathes of scripts that sent emails directly via sendmail (e.g. via PHP’s mail() function). The main flaw in the original sendmail wrapper was security, though. As in Linux, every executable script must be readable by the user that calls it, the throttle table in MySQL was basically open and every customer could manipulate it. Every customer could raise his own throttling limit and circumvent it.

Today, I’m publishing my new sendmail-wrapper that is going to fix all the flaws of the previous version and add some nice extras.
The new sendmail-wrapper is written entirely in PHP and does not require any external libraries. It is a complete rewrite and has pretty much nothing in common with the old Perl version.

This project is hosted on Github

Features:

  • Lets you monitor any mail traffic from PHP scripts
  • Allows throttling (limiting) emails sent by PHP’s mail() function
  • Throttle by sent email and/or recipient count per day
  • Logs both to syslog and database with message metadata
  • Logs common mail headers like From, To, Cc, Bcc, Subject
  • Fixes Return-Path header on the fly for users who did not correctly set it
  • Highly secured setup, customers cannot access the logging/throttling database
  • Standalone PHP application without any external library dependencies
  • Built for shared webhosting environment where PHP runs as cgi/FastCGI/suPHP
  • No cronjobs required, sendmail-wrapper will reset counters automatically every day

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Webapp-scanner

Webhosting customers are messies, at least some of them – or (sadly, that’s the truth) the bigger part of them. Some people still think they can run the same blog software or CMS for years without ever caring about upgrading. I tell my customers over and over how important it is, to keep their website up-to-date and don’t let any outdated code lying around. Still, as long as their website doesn’t get hacked or defaced, they don’t really seem to care.

If you’re in the same situation as me and you are providing webhosting services to your friends or customers, read on.

This project is hosted on Github

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css.php