But do try sending it from another email app or web based email.
https://www.google.com/search?q=email+to+phone+one+character+per+line finds it's a common issue but here I don't see what email app was in use.
When I email a friend of mine he says that what he receives is a vertical listing of every letter of every word. My emails don't list in sentence form as you are reading in this post. Like: the word "preview" would come to him as : p
I also seem to remember that he said emails from me are the only ones that are received this way. I email him from a computer not a phone if that might make a difference. Anyone have a solution for this?