for security reasons wp_kses_post is used. So some code may strips out. If you want to keep as you type you need to change 2 lines of code in class-fepadmin-settings.php and remove wp_kses_post from line 444 and 512 ( fep version 4.8)
Sorry to disappoint you but i did you see a reason to hide autosuggestion when you have option to send messge to multiple users. You can disable so that users can not message to other users but can send message to admin
Can you please check your purchase history page and change your website url for that license. Then go to your new website, remove license key then save again add license key and again save. I think that will solve your issue.
Let me know.
Sorry for late reply. I was out of internet.
I will investigate line break issue.
About attachment right now it will not display in browser but we can introduce that option later.
Also all attachments will show in media tab in backend where all attachments can be viewed.
Please do not change between “Text” and “Visual” tab. it will preserve all your code. Keep in “Text” tab and add your code then save. then send a message and see your email.