The Mail Plug-in Not working for me

I am trying to Use the Mail Plug-in

from e-book.

If you use Apple Mail, you can also send one or more selected messages to DEVONthink from within Mail, making it easy to archive particular messages (as opposed to entire mailboxes or large sets of messages) as you work.
The plug-in is installe

but the option is not appearing in the Mail Message Menu


Did you enable it in the preferences of Apple Mail (see description of the option on your screenshot)?

Now it works. thanks.
I missed that.