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This format is used by SpamAssassin as its input/output format, since it's the standard format for e-mail message interchange.
How to
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Retrieve an RFC-822 Format Message from an E-mail
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The folks at [SpamCop].net maintain \[http://www.spamcop.net/fom-serve/cache/19.html an excellent resource\] addressing the common question of "How do I get my email program to reveal the full, unmodified email?" from many popular e-mail clients for numerous operating systems.
This Page
Much of this page was copied from \[http://www.asspsmtp.org/wiki/Headers_and_Body this ASSP wiki page\], which in turn used bits from Wikipedia. thanks! Wiki Markup