Author Archives: Dániel Novák

ORF 6.6 – Don’t break the chain

The latest and greatest version of ORF is now available: the installer can be downloaded from the Client Portal section of our website after logging in.

ORF 6.6 adds support for a new email authentication system called ARC (Authenticated Received Chain), which is a novel protocol coming down the standards pipeline intended to solve email delivery issues caused by intermediate mail servers that render SPF, DKIM or DMARC invalid in emails.

For detailed information regarding this release, please consult the ORF Change Log.

Edit: If you are using ORF on Exchange 2010, please make sure you read the following KB:


ORF 6.4 – New year, new update!

The latest ORF version has been released earlier today adding complete IPv6 support to ORF, allowing it to be integrated into both IPv4 and IPv6 infrastructures, and extending the Sender Whitelist and Sender Exception lists with a new sender validation option to prevent spammers from abusing whitelist entries to circumvent filtering.

If you are interested in learning more about the changes please visit the ORF 6.4 Change Log. When you are ready to deploy the new version, download it from the Client Portal.

If you have any questions about compatibility or using ORF 6.4 in specific setups or infrastructures, please send us an email to and we will respond as soon as we can.

ORF 6.3 has arrived!

The latest update adds support for a wide range of archive formats, such as RAR, ARJ, Z, 7z, etc., so no archive or container remains unchecked anymore during attachment filtering. The regex engine has been upgraded too and it can now properly recognize and match Unicode characters above U+FFFF (65535). Finally, a hashing bug that prevented ORF from verifying ed25519-type (DKIM) public keys has been fixed as well – along with a bunch of other minor user interface and management tool issues.

Visit the Client Portal to get the latest installers.