Twisted Mail contains high-level, efficient protocol implementations for both clients and servers of SMTP, POP3, and IMAP4. Additionally, it contains an "out of the box" combination SMTP/POP3 virtual-hosting mail server. Also included is a read/write Maildir implementation and a basic Mail Exchange calculator (depends on Twisted Names).
WWW: http://twistedmatrix.com/trac/wiki/TwistedMail
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