Hushmail - Full-featured email service with integrated security to safeguard your data.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
AOL Mail - FREE e-mail account with IMAP, spam and virus protection with UNLIMITED storage (GMail max. 7.3 GB).
Roundcube - Web-based IMAP email client
Yahoo Mail - Web-mail with a terabyte of free storage space & spam protection. Yahoo!
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.