I already screwed up a few times because when sending a sMail the "full inbox" text looks a lot like the "message sent" text... It would be awesome if the full inbox message could be made bigger, or maybe red. Something to make it noticeable immediately.

I've done that too so support.

I've never had a "full inbox" message that I know of, but I think it should be in bold print or red if I got one, so I really support this.

Full support, it should be something very noticeable