MailMarshal v 6.4 is the current shipping version

Building on MailMarshals' enviable reputation for power, speed and huge array of features MailMarshal SMTP v6.4 major new improvements now include;

• Enhanced Routing
  Routing tables with multiple load balancing, fallback hosts, and special cases can be created. Local delivery can be set by server name.
  
  
• New Additional Spam Engine: SpamProfiler
  A new layer of Spam filtering that allows denial of spam messages at the Receiver.

• New IP Reputation Services Support
  Realtime Blacklists RBL's have been very important in reducing spam.  New IP Reputation services list services are becoming a more important tool.

• Office 2007 Document support
  Office 2007 documents are now fully analysed in their component parts.

• Enhanced Anti-Relaying
  Multiple Anti-Relaying tables can be created and selected separately for each node in an array.
  
  
• Updated Spam Quarantine Management website
  The site has been redeveloped in ASP.NET 2.0. The Administrator has GUI access to view and change user whitelists, blacklists, and additional addresses. Skins and language packs are supported.

• Marshal Notifications- RSS Feeds
  The Console provides a RSS based alert and news service.
  

• Automatic Adaptive Whitelisting
  Allows Reputation checks (DNS Blacklists) to be skipped for trusted servers.
  
  
• Domain Specific Notifications
  If you have multiple domains or or companies, you can further customise email notifications.
  
  
• Enhanced SpamCensor
  SpamCensor can now base action on attachment contents.
  
  
• 7Zip support
  Unpacking of 7Zip files is now supported.
  
  
• Enhanced low disk space handling
  Includes a warning and stop threshold, with periodic email notifications
  

• Event Log viewer
  Console provides a view of event logs on all servers in the MailMarshal installation.
  
  
• Centralised Upgrades
  Upgrades can be delivered to all servers in an array using the Configurator interface (after the initial 6.4 upgrade has been applied to all servers).

• SPF (sender policy framework) support and SenderID support. (added in 6.2)
  

What does this actually mean for you? Read this PDF on the new features and benefits.

If you are a current MailMarshal SMTP customer with a valid, current Essential Care support contract you are entitled to download this upgrade free of charge.