First of all if you have people abusing the mail function one solution is to disable it via the disable_functions directive inside your php.ini file.
If you must append headers then you could easily specify a path to a sendmail using a configuration that would append any header that you like to outgoing e-mails. There are plenty of other solutions available. Ilia -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php