I have fews mails redirected in the root mailbox because of an inexistant recipient.

It seems impossible to know the script trying to send these mails.
the mail received in the root mailbox is emptied with only the notification of undeliverable recipient.

Is there a way to keep the original message in the body of this mail ?

PS : I hope I am understandable, my english is still limited (but I work on it

Edit : I forgot to say my MTA is sendmail