thanks for your reply...I did that but still no bounce back is there.
I am sending a email to [email][email protected][/email] which has no existence in reality...so it SHOULD bounce back to the return path I mentioned....but not...Also I sent a email to my gmail acct....I checked the headers no Return-Path is mentioned there.
I am sending email from my yahoo acct and I checked the filters.....nothing is there which says that I have blocked the bounce back emails....