A very good extension that works, but you have to thoroughly configure it first.
This add-on rightfully deserves a solid four stars.

Improvement suggestions:

1. A wildcard (*) Greylist expression makes the [+Greylist ] button redundant, so this button should be hidden whenever the * Greylist expression exists.

2. Would be really nice to have this extension combined with the "I don't care about cookies".
so single extension would handle both roles.

This is a great extension, and needs little more to be rated full five stars. Thanks.