mail() question

Sorry in advance for being redundant. I was unable to find the answer I needed, on the php.net site. We have a mailto form, which uses the mail() funciton. For the most part, it works as intended. All of my headers seem to be coming through intact (To, From, Reply-To, Return-Path, Error-To, etc). However, if the message should bounce, it always bounces back to nobody. When we want it to bounce back to say, rch instead. Can any offer a possible solution here? TIA -- Robert Hough (rch@solveinteractive.com)