Release Notes: Minor bugs were fixed.
Release Notes: This is a minor bugfix release. Upgrading is only needed if it resolves a problem you're having.
Release Notes: Bugfixes and packaging fixes. Upgrading is recommended.
Release Notes: This release adds new features, including SMTP report delivery, further RRD-based reputation development, improved integration with postfix configuration files, and experimental extensions enabling experimental use outside of email. Bugfixes include resolving a verification problem with some (rare) signatures and a crash bug when the query cache was used. Upgrading is recommended.
Release Notes: Another minor bugfix release. Upgrading is not required unless something fixed in this release is causing you difficulty.