Description: ------------ Using Mail with "mail" fails when using PHP 4.2.2 because of the last parameter to mail(). (As far as I have understood, you support PHP 4.2.2 even thought it's not listed in the box above.) In addition, it's returning a boolean instead of PEAR::Error as the manual says it should do. It is simple to fix: If the last parameter is empty, simply do not use it at all. You can find a patch here: http://ununique.net/div/mail.php.diff It checks if there is any $params and if there isn't, do not use the last parameter. It also fixes the problem with returning false instead of PEAR::Error on failure. Note that this is a possible BC - if people rely on it returning false instead of PEAR::Error, the code will not work as expected. Safe mode is turned off. Reproduce code: --------------- // Using PHP 4.2.2 $pmail =& Mail::factory("mail"); $mailres = $pmail->send($address, $message["headers"], $message["body"]); Expected result: ---------------- $mailres should be true Actual result: -------------- $mailres is false because mail() fails with the 5th parameter.