Downloaded the trial version. After trying it I purchased a serial.
Too soon I discovered.
Thing is, the app does not only install the mail plugin itself, but another app as well, called " Mail Plugin Manager"
This is not clearly stated and I don't like it when " extra" apps are installed without my knowledge.
After uninstalling it and installing it again, there was an (somehow hidden) option to do an install without the "extra app".
Thought this was the solution at first but then I noticed that, whenever I opened mail, the damn plugin gave me a popup where it shouted it couldn't update itself without the Mail Plugin Manager. There was no way this could bet turned off.
Wrote the dev about this annoyance but of course, no response.
Sorry, waste of money and a one star rating.
Beware of installing, you maybe get more then you want. I don't see the purpose of this "pushing" apps to users.