Maintain a folder which has its messages stored on a remote server. The communication between the client application and the server is implemented using the IMAP4 protocol. This class uses Mail::Transport::IMAP4 to hide the transport of information, and focusses solely on the correct handling of messages within a IMAP4 folder. More than one IMAP4 folder can be handled by one single IMAP4 connection. WWW: https://metacpan.org/release/Mail-Box-IMAP4