ORF (Open Relay Filter) 4.0 almost ready with 4.1 close behind, featuring Exchange 2007 support.

My favorite anti-spam/filter software has a new version coming out soon, with version 4.1 that supports Exchange 2007 soon after. The cost of the software is per server instead of per mailbox, which makes it very attractive for smaller offices.

Planned features for 4.0:
1. Combined Actions: Tag and redirect email.

2. Test Exceptions: This feature allows some tests to take precedence over blacklists (Attachment Blacklist, External Agents, AD Test and the Recipient Blacklist)—filtering for viruses even when the email would be whitelisted.

3. New database model: Support for storing Greylisting and Auto Sender Whitelist data on Microsoft SQL Server. More reliable local database support.

4. Subject logging: The name tells it all, email subjects at the On Arrival filtering point are now logged.

5. Improved log filtering: Rule-based filtering in the ORF Log Viewer that provides much greater flexibility than the current filter.

6. 64-bit support: Support for 64-bit editions of Windows Server.

7. More types of supported IP range formats: no more subnet mask mess (except if you want).

8. Greylisting improvement: Now Greylisting can be configured to accept delivery re-attempts from the same Class C (/24) block. This means lower number of false positives.

9. Auto Sender Whitelist Automatic Response Detection: Namely, automatic recognition of Out of Office autoresponses. These are not added to the Auto Sender Whitelist, thus the database does not become polluted.

10. Update notifications: the ORF Administration Tool, Log Viewer and Reporting Tool now tells you if there is a new ORF version available.

11. Significantly improved PowerLog preprocessing speed: about 75 times faster now.

12. All known bugs fixed.

Read more about it here.