To do something like this, you would need to use a 3rd party SMTP object like the one I wrote: http://www.aspnetemail.com In aspNetEmail, you can do something like: C# EmailMessage msg = new EmailMessage(); msg.ReversePath = "bounceEmailAccountHere@whatever.com aspNetEmail will use the ReversePath value in the MAIL FROM command during the SMTP Session. I could have easily of called this property "ReturnPath" or "EnvelopeFrom".
EmailMessage msg = new EmailMessage(); msg.ReversePath = "bounceEmailAccountHere@whatever.com
var
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