This article contains the complete list of changes implemented in ORF 5.4 compared to the previous 5.3 release.

Changes in version ORF 5.4

• NEW: Built-in recursive DNS resolver
  The new DNS resolver can obtain DNS data without the help of a dedicated DNS resolver server. This greatly simplifies the DNS setup in ORF and eliminates common DNS configuration problems that lead to a diminished spam filtering performance.
• IMPROVED: Updated DNSBL definition set and recommendations
  The new set is compiled based on comprehensive true positive, false positive and overlap analysis to maximize the spam catch rate without risking the loss of legitimate emails.
• IMPROVED: RFC7208-compliant updated SPF client
  ORF implemented SPF long before it became standardized. The final RFC4408 standard and the most recent RFC7208 version contain few significant changes, but they are more lenient in handling common SPF errors, so this update allows evaluating more policies than before.
• IMPROVED: Exchange 2013 CU9 Health Probe detection update
  Microsoft® Exchange 2013 regularly sends health probe emails as a part of its Managed Availability feature. ORF has a built-in mechanism for detecting and ignoring these emails to avoid clogging up the logs. The CU9 package for Microsoft® Exchange 2013 introduced a feature that broke this detection in ORF and this update restores the detection.
• CHANGE: Microsoft® Windows 2000 support retired
  The new version no longer supports Microsoft® Windows 2000.
• BUGFIX:
  All known bugs fixed.