I’m sure you have seen the good old exclamation mark in email many times. Sometimes even multiple times in a row.
Now think about it. Exclamation marks are at the END of the sentence. You have already read the sentence before you even knew that it was supposed to be read with emphasis.
Here is a better idea. Emphasize with WORDS. Want something in a sentence or paragraph to have emphasis when it’s read? Capitalize the word or phrase instead of using an exclamation mark.