Rated 2 out of 5 stars

Unfortunately not (yet?) compatible with the new v68.0 :-(

Will there be an update for the lateste TB version?

This review is for a previous version of the add-on (2.0.1). 

Update: compatible 3.0.0 version is released.
There exist a pre release compatible with TB 68: https://github.com/lieser/dkim_verifier/releases/tag/3.0.0pre5

The progress to finalize the release is tracked at https://github.com/lieser/dkim_verifier/issues/115

Next time please don't use the reviews to report problems. Use https://github.com/lieser/dkim_verifier/issues or write me an E-Mail.
See also https://addons.thunderbird.net/en-US/review_guide