Hushmail is a web-base email service offering PGP-encrypted e-mail, file storage, vanity domain service, and instant messaging (Hush Messenger). Hushmail uses OpenPGP standards and the source is available for download. Additional security features include hidden IP addresses in e-mail headers. The free e-mail account has a limit of 2MB, and no IMAP or POP3. Paid accounts have several hundred MB of storage as well as IMAP and POP3 access. If public encryption keys are available to both recipient and sender (either both are Hushmail users or have uploaded PGP keys to the Hush keyserver), Hushmail can convey authenticated, encrypted messages in both directions. For recipients for whom no public key is available, Hushmail will allow a message to be encrypted by a password (with a password hint) and stored for pickup by the recipient, or the message can be sent in cleartext.