SocketMail Professional Edition

Fast, Powerful and scalable multi-domain webmail hosting system. Integrates with Sendmail/Qmail/Exim/Postf ix for efficient incoming mail processing. Require dedicated server/VPS with root access. Scalable to support bigger mail traffic. Hosted domain may have different settings and webmail skin. Optionally enable POP3/Outgoing-SMTP for specific domain. Domain may be enabled to offer premium email account with extra features or extra spaces and collect payment via PayPal/Ibill/Nochex/2Chec kout/Authorize.net. Cool webmail with ajax-enabled functions. Stop spam mails with MailGuard. Allow your user to access using their phones via WAP add-on. Many more great features that you won't get in other webmail system.