Grammarians require that if you start your letter or email (to a grammarian) with an interjection (i.e. Hi or Ugh) you should stick in a comma after said interjection.
So:
Hi Aunt Gladys!
becomes
Hi, Aunt Gladys!
But no one does this except the nitpickiest of know-it-alls.
Be a rebel! Live a little! Stick it to the man!
Yee-haw, dude.
BONUS:
According to the Chicago Manual of Style, internet is still Internet. I hate capitalizing a non-place but with a team of therapists I’m learning to deal with this outrage.
DOUBLE BONUS:
Are you still writing e-mail? It’s email now. Some progress is being made on some fronts.
C h a z z W r i t e s . c o m 