If users get email notifications by configuring their Settings to get email notifications for things they follow in Inbox, then hiding new activity in Inbox also stops email notifications. They have to go to their Jive Inbox to click Hide New Activity, which is not intuitive, especially for people who live in email and not in Jive.
It's also ridiculous that they have to manually go into their settings to adjust this. As a sys admin, I should be able to set that as the default setting, so people have to opt out of getting email notifications, not opt in.
Oops, I missed that you already know how this works. Sorry, this is one of my pet peeves and I jumped on my soap box before reading your post carefully.