A type for a part of an E-mail
Tinymail 1.0
http://tinymail.org/API/libtinymail-1.0/libtinymail-tny-mime-part.html
About
A mime part (RFC 822, 2045, etc) is a part of a message. For example the body of a message, an attachment of a message, a encryption key or a public key, a calendar item
