Hushmail - Full-featured email service with integrated security to safeguard your data.
Roundcube - Web-based IMAP email client
AOL Mail - FREE e-mail account with IMAP, spam and virus protection with UNLIMITED storage (GMail max. 7.3 GB).
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Yahoo Mail - Web-mail with a terabyte of free storage space & spam protection. Yahoo!
Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.