That he cares about you. If he does that to everyone (eg in forwarded mails or mails sent to not only you) it may be his signature thing
Usually it mean's she wants the D.
The content of the poem determines what it means.
She loves you but is too scared
No, he meant that he loves you as a friend not as a mate.
Normally to show her mood or possibly how she feels about you!
She likes you! How can you not know that?
uhhh everybody knows that ignore it and curl up and die you jackwagon
IT depends on the content of the email. It might be a curtious message
"XO" (sometimes repeated) is a commonly used shorthand for "hugs and kisses".
it means "welcome to the 21st century you sexist pig"
Maybe he wants to talk to her more, and get to know her.
That she likes what you have been telling her and she wants to hear more.