This plugin automatically saves messages as they are being composed in order to prevent accidental loss of message content due to having browsed away from the compose screen or more serious problems such as browser or computer crashes. When a message appears to have been lost and is available for recovery, the user will be prompted about whether or not the recovery should proceed.

SquirrelMail is a standards-based webmail package written in PHP. It runs on top of any IMAP server.