Reply restrictions for mentions in private email channels

Business problem

When a user is mentioned in a conversation within a private email channel that does not belong to them, they currently have the ability to send replies. This creates potential privacy concerns and allows team members to inadvertently intervene in restricted personal communication channels.

Wished result

Restrict the ability to reply to conversations in private email channels for mentioned users who are not owners of that specific channel. Users should still be able to view the context they were mentioned in, but the option to respond should be disabled.