- Advanced Spam Filtering
- RBL Blacklisting. (i.e. Spamcop, Spamhaus)
- Virus-Scanning
- Completely MIME compatible
- Preview Messages
- Contact List Members Filter Proof
- Multiple Skins
- Limit Users Outgoing Mail (Depending on User Level)
- Sort Inbox With Several Criteria
- Fully customizable via HTML templates
- Mod_Perl Compatible
- New Mail Sounds
- WYSIWYG Mail Interface
- Multiple Tiered Premium Accounts
- Premium Accounts using Paypal & Subscriptions
- SMTP or Sendmail
- Compatible with any platform using Perl
- Fully functional calendar and scheduler
- Unlimited User Folders
- Folder Filtering (Incoming mail directed to specific folders)
- Email notifications of new mail
- MySQL backend
- MySQL backup of data (requires access to mysqldump)
- Mail signatures
- Auto suspension of unused accounts
- Welcome message for new users
- Comprehensive Administrative Control Panel
- Sends and receives attachments
- User accounts limited storage defined by admin system wide or user by user basis
- Unlimited users
- Address book
- External mail support for users so they can check mail on other servers
- Ban IP addresses or range from accessing the Messenger
- Ban usernames
- Delete suspended users
- Completely customizable for foreign languages. All error messages easily customized
- Multiple domain support allowing you to offer more than one domain for your users to choose from
- Customizable date format
- Time offset
- Limited Inbox display customizable by admin (define how many emails displayed per page)
- Mail can be retrieved by user initiation or by Cron jobs

· Linux Server with htaccess, Mod-Rewrite, Mod_Perl, Cgi, MySql Database, PhpMyAdmin (or similar), FTP access, Hosting Control Panel, POP/SMTP mail account.