Locking Down Outlook Messages

Is there any way to lock a message after it is sent so the information cannot be editted when it is forwarded or replied too?  Basically, hypothetically speaking, if an employee forgets to send an e-mail and the next day realized the error right now they could forward a message from their send items change the header information and body of the e-mail to make it appear that the message was sent to someone else.  Then claim that the original e-mail was accidently deleted, but they have the copy of the e-mail that they forwarded to you.  I want to prevent this from happening, can sent messages be locked so the header information and the body of the e-mail cannot be altered?
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as in encrypting a single email?


Or do you want this across the whole orginisation
commengAuthor Commented:
I want to do it across the entire company.
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commengAuthor Commented:
So I would have to upgrade us to Office 2007 and then I could lock down sent items so they could not be altered?  Would a person then be able to create a new message, type in the header information and still forge an e-mail?
namolConnect With a Mentor Commented:
You would need to upgrade all the users to at least Outlook 2007 to implement IRM through Outlook. You can also use IRM in Exchange Server 2010 on the server side to implement it also.

The downside to this is if they really wanted to, they could bypass the outlook 2007 irm by using a registry hack. You might want to implement a mail archiving solution to track when emails were sent etc. https://www.mailarchiva.com/home.jsp?page=features.htm
commengAuthor Commented:
We have a mail archiving solution which how I found out that an e-mail was forged.  The owners want to prevent it from happening it again and they want to know how to lock down sent items so that they cannot be edited again.
IRM would meet your goals. Is this for a small business or a decent sized company that this is going on at? It sounds more like a HR problem than a technical issue honestly.
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