Using PHP with bounce-back emails

Perhaps this is more of a SendMail issue, but I wish to use PHP to accomplish this... I use PHP / MySQL to email my mailing list on a daily basis (100,000+ emails). I have a current way of keeping track of inactive & active members, but it's not very good...I'm actually afraid to remove inactive members, because I don't want to remove legitimate members. The solution cannot involve modifying my database, as I do not want to edit thousands of lines of code. Instead, I wish to use the bounce-back messages from mail servers. I.e., "Account Over Quota", "Invalid Account", etc...I would develop a script that would log this, and delete members accordingly. The question, is how to develop this in a PHP script. All of the bounce back message currently are delivered to httpd@host.mydomain.com. I currently have that user aliased to /dev/null. Obviously, I could simply alias that account to a valid email account, but then I have to manually sift through thousands of emails (some of which are warnings, in which case I would want to take no action, some of which are Account over Quota, which I also don't want the account deleted, etc). Instead, I want to "pass" this email + data to a PHP script. The script would search through the text of the email, find out why it was returned, and take any necessary actions. I know how to code PHP scripts to run on command line. What I need to know is: 1) How to alias the mail to a PHP script? 2) How to not only alias this mail, but also pass off the message as to why it was returned (usually contained in an attachment). Please help! __________________________________________________ Do you Yahoo!? Faith Hill - Exclusive Performances, Videos & More http://faith.yahoo.com