Over the past few years the add-on collected many DKIM keys, but there sees to be no good way of cleaning things up in one go.

I can only select one key at a time and then choose 'delete selected keys'.

And the same applies for the signers rules database.

Would be great if this can be fixed.

Also additional features, such as the ability to sort on columns (like the 'last used' column) would be very useful.