Yes, it should be "e-mail."
Email is correct. Some people still use e-mail, with a hyphen, but email without a hyphen is used much more often.
Email is the correct spelling with no hyphen. If you run it through the spell checker, email passes, but e-mail does not.
Yes, that would be correct.
"3" should be written out as a word, as it is less than ten, and I suggest a hyphen, making it "three-pillow orthopnea."
"Not like that" can be grammatically correct, depending on the context.
Yes, 'for free', is grammatically correct.
Yes! That is grammatically correct!
Yes it is a grammatically correct
This is not grammatically correct. The correct form is 'you do not know', or the abbreviated 'you don't know'.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.