Zimbra - Web-Based Email & Calendaring Solution
Zimbra is open-source server software for email and collaboration - email, group calendar, contacts, instant messaging, file storage and web document management. The Zimbra email and calendar server is available for Linux, Mac OS X and virtualization platforms. Zimbra syncs to smartphones (iPhone, BlackBerry) and desktop clients like Outlook and Thunderbird. Zimbra also features archiving and discovery for compliance.
Take a demo-tour of the Zimbra email and collaboration system HERE
At Reverse Polarity, LLC, we use qmail in all of our custom email server solutions. qmail has proven to be a very robust, stable, and secure open-source email server solution for our email needs as well as the needs of our clients.
How secure is qmail? Take a look at the author's "qmail Security Guarantee" page HERE
If you choose to have us build you your own email server, all of our email server builds include the option to access your email accounts via POP3 or IMAP clients or via a webmail interface. Managing your company's email accounts is also quick and easy with a web-based email administration interface. From this interface you may add or delete email boxes, change user passwords, and manage forwards, vacation notices, mailing lists and auto-responders.
Other Email Systems
Reverse Polarity LLC has extensive experience and proven expertise with other widely used email and groupware systems such as Open Text FirstClass, Novell Groupwise and Microsoft Exchange.