It might have something to do with the missing quote as shown here:
From         =>test@yahoo.com',
#              ^ missing quote

[download]
Also, you needn't double-quote Return-Path as you have in your example also:
"Return-Path" =>'cm@route.com',

In reply to Re: Bounced address in MIME::Lite by hacker
in thread Bounced address in MIME::Lite by Anonymous Monk

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