This is me, but with my own emails. Even something like “Have a great day.” just reads like a “Go fuck yourself” in my head, regardless of context, and so I tend to overuse exclamation points to make the tone very clear. I’ve very much got the 'tism, so having clarifying punctuation and even the more accepted use of emoji in work communications has been an absolute blessing for me not immediately assuming the worst in a work communique.