You can add your users to role for communication but if you make this writable then you get the unwanted side affect of having editable received emails which also can mess up the formatting of certain text in some emails
@Julian_Robbins, @thiras Use a mix of ‘Set only once’ under doctype customization or ‘Read Only’ under form customization. I’ve tried this and now emails, for example, cannot be edited, but they can also be closed and reopened … which is how i think it should work.
You may use this stupid solution
Add role All to Communication Doctype and give it read .
see if your problem solved and if it have a side effect behaviour.