/*
php mail() doesnt know about bounced emails simply because it doesnt
>reach it. there's no callback that allows you to register for bounced
>emails. the email is received by your smtp server and is redirected
>to the appropriate account (depending on the configuration)

you can get bounces and replies by adding some headers:
*/


$mail_header .= "Return-Receipt-To:\"RETURNRECEIPTyourdomain.org\" \n";
$mail_header .= "Return-Path: \"BOUNCEyourdomain.org\" \n";

/*
and then off course read out these addresses! 
*/

Get Bounced Emails

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PHP