Hushmail

Hushmail is a web-based email service offering PGP-encrypted e-mail, file storage, vanity domain service, and instant messaging (Hush Messenger was closed on July 1, 2011). Hushmail uses OpenPGP standards and the source is available for download. Additional security features include hidden IP addresses in e-mail headers. A free e-mail account has a storage limit of 25MB, and no IMAP or Post Office Protocol (POP3) service.