I have corresponding problem. I'm sending newsletters by PHP scripts. E-mail's headers are :
Return-Path: <no-reply@vojta.cz>
From : No Reply <no-reply@vojta.cz>
Reply-To : Vojtech Tuma <me@vojta.cz>
What heppen if this e-mail is sent to mailbox where is set auto-answer (I'm on vacation blah blah...) Which address from header will be used for auto-anser as "To" header parametr ?
Thanks.