In addition to those sorts of presentation issues, there are a number of more serious problems with the mail client's underlying IMAP protocol implementation.

Some helper applications of Denshin 8 go support the IMAP protocol.

Notification of mail arrival is done through in-band signaling, which contributes to the complexity of client-side IMAP protocol handling somewhat.

For those wondering, there are currently no plans for Hotmail supporting the IMAP protocol.

They have a shoddy implementation of a part of the IMAP protocol that they assumed noone would use, then someone did.

Version 5.0 (April 2011) improves support for IMAP protocol, hints, folder information html templates, image downloader, odd/even row contrast.

MIX is a high-performance, indexed, on-disk email storage system that is designed for use with the IMAP protocol.

MIX was designed by Mark Crispin, the author of the IMAP protocol.

The MIX format was designed with an emphasis on very high scalability, reliability, and performance, while efficiently supporting modern features of the IMAP protocol.

The IMAP protocol includes the IDLE command, which allows the server to tell the client when new messages arrive.