There are several rules that you need to remember while writing emails

  1. You do not need to use your address
  2. You can begin with an informal salutation and a name of a person
  3. Use Present Continuous to talk about experiences you are currently having
  4. Use Present Perfect to talk about experiences you’ve had so far
  5. You should divide your email into paragraphs
  6. Sign off informally
  7. You can use contractions