But its an extra preventative measure and prevents those moments when recipients send a reply to everybody accidentally.
FAQ
Why dont I see a Design a Form… option under my Developer tab?
You will have to add it to your Ribbon using these steps.
The option should then be added to the Developer tab.
Why is my Design a Form option grayed out?
I have seen this problem and Im not sure why it happens.
Will this disable Reply All for non-Outlook users?
It depends on the email client.
Some do not support it, like Yahoo Mail.
Gmail does support it though.