In some environments, Confluence can contain restricted data, which by security policy is not allowed to end up in an email.  Thus we currently have to disable ALL emails from Confluence and Jira which drastically limits our collaborative experience.  Therefore this feature is necessary for us to be able to work with emails notifications. Please prioritize. 

We also need this feature to fulfill a security requirement.

Please prioritize.

Bump

We use spaces to maintain sensitive system functional information that should NEVER NEVER leave confluence. When we found that if a user selects email notification: 'Show Changed Content' allows information be copied to an email and sent out, we were quite alarmed and upset.    

Its very important that this be a Space Admin over ride option.  It is the Space Admin who should have right to lock down the information from being emailed out where the email could be accidently forwarded.

Disabling this is very important for sites that have sensitive information

I think this is a really important issue. 
1000s of companies use confluence.
1000s of pages of sensitive data that are thus being sent via email everyday.
It feels very insecure.

The comment above describes the same issue we have! :/

In the Netherlands we have something called the BIR. In this document there are rules concerning the way content is shared and what can and cannot be done. 1 Of the problems is that content with the status "confidential" can only be shared through e-mail which is encrypted and the content is in a password protected file. 

So if we start using Confluence and we create a page which has confidential content it cannot be emailed. We can as a rule ask all the users to disable the possibility to uncheck the "Show changed content" in their settings but there is no way to check this. This is therefore not an option.

We have tried the solution https://confluence.atlassian.com/confkb/how-to-globally-disable-e-mail-notifications-with-page-content-718670714.html but still this doesn't work. The mention functionality doens't work anymore. When you are a watcher you do not get warnings that a page is changed or a comment is made. The text of a blog will be send completely. 

The solution above (https://confluence.atlassian.com/confkb/how-to-disable-show-changed-content-to-all-users-407725054.html) is not a solution for us. We can't afford to have people changing there settings and being able to get classified content in their email.

I can't imagine that this effects so few companies with all the security scandals these days.

Being able to disable "show changed content" for all users and not allow users to turn it back on would solve a lot of problems for us.

Yep, seems like a security hole, and one we've had raised internally.

I'd like to add to the initial request with the following requirements:

1. Enforcement (ie, stopping users changing it back) is defiantely required to make this useful.
2. This needs to be available on the Cloud edition also; we don't even have a workaround.