IMPROVED: Combined Actions
The new version can tag and redirect the email at the same time at the On Arrival filtering point.

ADDED: Whitelist Test Exceptions
This feature allows some blacklist tests to take precedence over whitelists (Attachment Filtering, External Agents, Active Directory Integration and the Recipient Blacklist), which provides better email security.

ADDED: External Databases
Allows using Microsoft SQL Server databases for storing the Auto Sender Whitelist and Greylisting data.

ADDED: Email Subject Logging
The subject of the incoming email is now logged at the On Arrival filtering point.

ADDED: 64-bit Windows Support
ORF 4.0 can be used on 64-bit Windows Server editions.

ADDED: Auto Sender Whitelist Automatic Response Detection
This new feature prevents automatic responses (e.g. Out of Office autoresponses) from polluting your Auto Sender Whitelist.

ADDED: Greylisting /24 Support
Now Greylisting can be configured to accept delivery re-attempts from the same /24 network block. This reduces the email delay from senders with a pool of outgoing email servers.

ADDED: Automatic Update Check
This feature periodically checks for a new ORF version and tells you if there is any available.

IMPROVED: Log Filtering and Search
The filtering feature of the ORF Log Viewer was completely redesigned to allow creating more flexible filters. The Search functionality is no longer column-specific (free text search).

IMPROVED: More flexible IP Address Definitions
In the new version, IP network definitions can be entered in various formats, including text range and CIDR notation.

IMPROVED: PowerLog Preprocessing Speed
ORF 4.0 preprocesses the PowerLog files about 75 times faster than the previous 3.0 version.

BUGFIX: PowerLog Files May Get Deleted
A bug in ORF caused the ORF PowerLog file under preprocessing to be deleted on the specific conditions (affected versions: 3.0 and 3.0.1).

BUGFIX: Legitimate Emails Tarpitted on Specific Conditions
ORF applied the tarpit delay on any non-whitelisted email on specific conditions (affected versions: 3.0 and 3.0.1).

BUGFIX: External Agent Exit Code Enabled State Cannot Be Changed
A bug in ORF prevented persisting the changes made to the enabled state of the External Agent exit codes (affected versions: 2.1, 3.0 and 3.0.1).