phlyMail

A low footprint, single user (Lite) or multi user (MessageCenter) webmail, PIM and groupware application using AJAX to provide a desktop-like GUI. Features: groups, shares, permissions, unlimited folders; local or remote mail storage; local indexing for fast mail access; multiple profiles (encrypted passwords, POP3 and IMAP); POP3s/SMTPs/IMAPs; TLS; themes (thus highly customizable); ability to answer; forward and send mails via SMTP or Sendmail; handles MIME, inline mails, quoted-printable and base64, attachments; APOP, POP3 AUTH and SMTP AUTH for more secure login; print view, source view, save your email to disc; export/import as .mbox, save mails as drafts or templates; quotas; address book, calendar (with ICS/iCal support), files manager and much more. Available as a free, single user version and as paid solutions for service providers, companies or individuals. And last but not least it is easy to install and setup.