ORF Fusion 5.5.1

ORF Fusion software is a spam filtering system for IIS SMTP Service and Microsoft Exchange Server. ORF Fusion uses multiple filtering technologies such as DNS blacklists, SURBL checks, greylisting and more to identify spam and other types of unwanted email. ORF Fusion offers an efficient, customizable spam filter that features the ability to use DNS and SURBL blacklists, online databases of various spam characteristics. Most of these blacklists, like SpamCop or DSBL, are updated almost every second. This ensures that ORF Enterprise Edition can block new spam attacks.

ORF features
Direct integration with Microsoft Exchange and IIS SMTP Service - the user does not need to reconfigure email flows or firewalls.
Transport layer SMTP filtering - ORF effectively blocks threats and saves server resources. The e-mail disruption function ensures that NDR attacks are processed in accordance with the standards and prevents the risks of Backscatter attacks.
Blocking spam, phishing, and other email security threats at the perimeter of your network - ORF communicates with Exchange Edge Transport servers at the perimeter, and enables the deployment of internal gateways and Exchange Hub Transport servers.
Scalability - the ability to process up to 1,000 or 1,000,000 emails per day. For load balancing scenarios, wide area networks, and clusters, ORF can provide its data and configurations to multiple servers without the need to purchase data center licenses.

System requirements
Microsoft® Exchange (2016, 2013, 2010, 2007, 2003)

Whats New
Updates: official site does not provide any info about changes in this version