Librfc2822 is a collection of Boost.Spirit parsers for e-mail addresses, e-mail headers, and other syntactic constructs commonly found in Internet messages. Older versions of this library were called librfc822 and consisted of hand-written parsers that were less convenient to use but had the neat advantage of being self-contained. In case this trait matters to you, the legacy code is still available for download.
IETF Request for Comment #2822: http://www.faqs.org/rfcs/rfc2822.html
Librfc2822 snapshot: librfc2822-HEAD.tar.gz (Change History)
Librfc822 Legacy Release: librfc822-1.2.tar.gz
RFC2822 Parsers for Haskell: http://cryp.to/hsemail/
1.5.7.1