Clonsigna is a Common Lisp library that allows interaction with IMAP4rev1 servers.
Clonsigna is very easy to use and follows the rfc3501 and rfc5256 specifications.
It allows both IMAP and IMAP over SSL communications.
The most of the commands output has it's own message parser that maps a server reply to a Common Lisp element (usually plists and classes).
Mail messages are completely handled and decoded by clonsigna parsers so that you'll have a mail message "ready to use".
Dependencies: iolib (git), cl-base64, cl-ppcre, split-sequence, alexandria, cl+ssl (cvs)
The following is an example, thought not exaustive, of how much Clonsigna can be easy to use: