Casual way of adressing on mail

Here are some casual ways to address someone on a mail:

Formal-casual

  1. Dear [First Name], (e.g. Dear John, Dear Sarah)
  2. Hi [First Name], (e.g. Hi John, Hi Sarah)
  3. Hello [First Name], (e.g. Hello John, Hello Sarah)

Informal

  1. Hey [First Name], (e.g. Hey John, Hey Sarah)
  2. Hi [Last Name], (e.g. Hi Johnson, Hi Smith)
  3. [First Name], (e.g. John, Sarah)

Familiar

  1. Hey [Last Name], (e.g. Hey Johnson, Hey Smith)
  2. [First Name], (e.g. John, Sarah)
  3. [Nickname], (e.g. J, S, or a nickname you're familiar with)

Business-casual

  1. Dear [Last Name], (e.g. Dear Johnson, Dear Smith)
  2. Hi [First Name], (e.g. Hi John, Hi Sarah)
  3. Hello [Last Name], (e.g. Hello Johnson, Hello Smith)

Remember to consider the relationship you have with the person, the tone you want to convey, and the level of formality required by the situation when choosing an address.