Cannot get eNewsletter to stop appearing in member sites

I Network Activated eNewsletter originally, then thought better of it and deactivated and just locally activated it on my main site. I use Exclude Plugins to stop those plugins I don’t want appearing in member admins to not appear and it seems to work with everything except eNewsletter.

In fact, I deactivated it altogether on the main site and it still appears in member admins. Is it specifically required by something else I may have turned on, or am I missing something?

With the PHP send option this could become a dangerous spamming tool in the wrong hands. Is my only option to delete it altogether, which would be a shame as I’ve got it working nicely using SMTP.