Sometimes I use the speech app on Macs that reads text out loud. it helps me hear what i'm typing or what others have said. it's really handy. I wouldn't let someone else proof read your emails though. That seems like a bad idea.
I wouldn't let people proofread my email. It's both dangerous and a really bad idea. I have dyslexia, and as a result, it takes me longer to type things. Much longer. But I do have online dictionaries that take spelling a whole lot easier without someone proofreading my email.