| Feature | 
Pro Edition | 
| GroupWare | 
| Personal contacts, calendars, tasks and notes
 | 
 
 | 
  | 
| Antivirus | 
| *NEW* Comes with ClamAV
 | 
  | 
| Supports third-party real-time antivirus
 | 
  | 
| Supports third-party command-line antivirus
 | 
  | 
| Antispam Measures | 
| *NEW* Whitelisting IPs for greylisting
 | 
  | 
| *NEW* Greylisting
 | 
  | 
| *NEW* Comes with SpamAssassin
 | 
  | 
| *NEW* Support for distributed environments
 | 
  | 
| *NEW* Create custom spam weights
 | 
  | 
| *NEW* Outbound spam checking and blocking
 | 
  | 
| Antispam module included with purchase
 | 
  | 
| Per-user spam weighting and actions
 | 
  | 
| Reverse DNS checks
 | 
  | 
| Bayesian filtering
 | 
  | 
| RBL listing detection
 | 
  | 
| SPF record checking
 | 
 
 | 
  | 
| Advanced domain and user content filtering
 | 
 
 | 
  | 
| Automatic internal spammer detection
 | 
  | 
| Security | 
| *NEW* Supports IMAP IDLE
 | 
  | 
| Support for SMTP 587 submission-only port
 | 
  | 
| RFC compliant SMTP, POP3, and IMAP
 | 
  | 
| Optional alternate SMTP port
 | 
  | 
| SMTP authentication options by domain
 | 
  | 
| Attack Prevention | 
| Manual and automatic IP black/whitelisting
 | 
  | 
| Automatic harvest attack prevention
 | 
  | 
| Automatic denial of service prevention
 | 
  | 
| Malicious script filtering in webmail
 | 
  | 
| Auto-Block IP addresses in RBL lists
 | 
  | 
| Administration | 
| *NEW* Specify user password strengths
 | 
  | 
| *NEW* Scheduled email reports
 | 
  | 
| *NEW* Historical reporting
 | 
  | 
| *NEW* Real-time performance dashboard
 | 
 
 | 
  | 
| Spam configuration from web interface
 | 
  | 
| Statistical logging and reporting
 | 
  | 
| Manage all settings via one URL
 | 
  | 
| Multiple spools (smart spooling)
 | 
  | 
| Domain level content filtering
 | 
  | 
| Current connection monitors
 | 
  | 
| Folder auto-clean to enforce user quotas
 | 
  | 
| Web Interface (Webmail / Administration) | 
| *NEW* Message status icons
 | 
  | 
| *NEW* User-level auto-clean
 | 
  | 
| *NEW* Mutiple skins with live editing
 | 
  | 
| *NEW* AJAX spell-check
 | 
 
 | 
  | 
| *NEW* Implementation in Microsoft .Net 2.0
 | 
  | 
| *NEW* Address field auto-complete
 | 
 
 | 
  | 
| *NEW* POP retrieval from external accounts
 | 
  | 
| *NEW* Inbox message preview window
 | 
 
 | 
  | 
| RSS, RDF, and Atom news feed integration
 | 
 
 | 
  | 
| Import and export contacts
 | 
  | 
| Save items as drafts
 | 
  | 
| Support for user aliases
 | 
  | 
| Support for domain aliases
 | 
  | 
| List server
 | 
  | 
| Configure sub folders
 | 
 
 | 
  | 
| Rich text editing
 | 
 
 | 
  | 
| Mailbox spam filtering
 | 
  | 
| Multi-language capable
 | 
  | 
| Auto signature
 | 
  | 
| HTML email compatible
 | 
 
 | 
  | 
| Content filtering per mailbox or domain
 | 
  |