Open WebMail is an open source webmail system designed to manage very large mail folders and files in an efficient way. This system is based on the neomail version 1.14 of Ernie Miller.

Open WebMail is simple and easy-to-use software along with a large number of features for its users. This software is considered as one of the major competitors of Microsoft Outlook.

Following are the features Open WebMail offers to its users:
· Auto-login – user don’t have to type his user name and password every time he logs in to Open WebMail. Users can enable or disable this feature according to their wish.
· Multiple language and character set – available in 3 languages, can change any charset to its default charset.
· Strong MIME support – MIME messages are displayed in an attractive format
· Address book supporting vCard – makes Open WebMail up to date with current address technology and allows sharing address book with other users.
· POP3 support – users can access mails from multiple mail servers
· Mail filter – built-in filters helps in filtering mails
· Antispam through SpamAssassin and antivirus through ClamAV
· Calendar with reminder and notification
· Webdisk support
· HTTP compression over HTTP

The system feature of Open WebMail includes
· Fast folder access
· Smooth message movement
· File locking along with various authentication modules
· PAM support
· Remote SMTP relaying
· Virtual hosting
· Persistent running through SpeedyCGI