mail function in PHP's

Hi, I'm newby in programming with PHP. I've been programming PHP in an UNIX environment with Apache as Web Server, I've been trying to send e-mail with de mail function, and it works fine if the sender exist. The program catch a From Header, to Header, Subject and messages. When the e-mail is delivered to the Receipt, in the From Header appears the e-mail we type as From Header, but when the e-mail is return due to errors, it is delivered to the owner that runs Apache. Is there someone that know how I can masquerade the Apache's owner? and if there is an error delivering the e-mail, the error must be sent to the Sender. Thank's a lot. Best Regards