To edit a message you have received in Mozilla Thunderbird:
* Copy the message from its current location to the Drafts folder
under Local Folders.
* Open that Drafts folder.
* Double-click the desired message.
* Do all the editing necessary.
o Editing the draft in this manner puts your email address
instead of the original sender's in the From: line. You can add a
Reply-To: header by clicking on an empty address field and selecting
Reply-To: from the drop-down menu. Then put the original sender in the
Reply-To: field.
* Click the Save button.
* Move the message back to the location of the original copy.
Found it here
http://email.about.com/od/mozillathunderbirdtips/qt/et_editreceived.htm
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Jules