You cannot, of course, use this is a primary criterion because there will be hoax-sters with more sophistication and greater grasp of English than others, but this can be a significant piece of corroborating evidence. You can also look at the email "header".
The header is a section of the email, usually invisible under normal conditions, that contains
Tom Richards —
My husband built a custom gaming pc but it had some issues he wasn’t able to figure out on his own. We had a hard time