Eric, How is From: A@B From: X@Y Different from From: A@B, X@Y (which is perfectly legal under RFC822) ? As I understand it, if you have multiple FROM addresses there HAS to be a SENDER tag which identifies the actual origin of the mailfile. The sender tag has a higher "return priority" than FROM does anyway. In other words, I would say that you can deal with the problem by using the address specified in the SENDER field when multiple FROM lines (or FROM addresses) are detected. Andy