Simple solution: use the Zimbra archiving product. Then you have a proper, per-user archive that you can search and recover messages from.
Less simple solution: use Zimbra, disable POP3 access and use either the Outlook connector or plain IMAP, and take backups every night. So long as the e-mail is not deleted before the backup run, you can restore the account to a temp account, and copy/paste the message from the temp account to the real account.
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Freddie
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