First, let me say welcome to LQ. Second, please do not use terms like urgent in your subject. It is considered rude and you will get a better response if you do not. This is a free tech support forum where many are here for recreation and the only person to whom it is urgent is you.
The meaning of your question isn't clear, would you please elaborate.
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I want to track my bounced back mails
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What do you mean by bounced back mails.
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rejected before it is finally delivered.
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And what do you be by rejected before delivery?