Previously, I was using the dkim-filter package in Ubuntu 10.04 LTS for DKIM.
That package is no longer in Ubuntu 12.04 LTS. What's the replacement or alternative?
According to the SourceForge website:
Indeed - the project has now states:
You are quite correct - OpenDKIM is its replacement - its a fork of dkim
More information about the OpenDKIM filter is in the README file.
The version in Precise is slightly older then than the Project site - v2.5.0 vs 2.5.1 respectively.