I want to change my standard mail client on OS X 10.11. Therefore I open Mail's Preferences and change the standard Mail app there. But:
- When I then switch to another application and back to Mail, my standard Mail client is Mail again.
- When I click on a mail link in the browser, the expected mail client is started. When I click on the same link again, Mail is opened again.
To me it looks like something is changing the standard Mail client. The question is what and why?