Yeah, but Guest - if you bought a hundredweight of corn, you'd get 112 (or is it 120) pounds.
Email in most of the programs I've seen is stored in a database format, so that you can't readily move an individual message "off the machine." You need to "export" the whole folder, which can then be copied (caveats here) to another machine, but then you usually need to "import" the folder before you can open individual email files on the new machine. In most cases copying a single folder is not really sufficient, since there is at least an "index" folder that needs to go with the "message" folder.
You can do a "save as" to put an individual message "outside the email" program, but it's problematic whether such a save will get everything you want. It depends on which program you're using, the save-as filetype, and sometimes on preferences that you may have set without realizing it.
(One of the features of Outlook Express is that you can save as .eml which does give a true individual message file with attachements and headers intact. I'm not familiar with any other program that does it as simply.)
The best I can recommend is that you try what you have in mind and see if it works. Be advised though, that if you select a message long enough to save, export, send, or otherwise manipulate it in any manner except to DELETE you have "received" it for purposes of the spammers confirmation of your address.
Consider whether the miniscule chance that you'll "nail the b..d" is really worth it.