Formal
(note: First names are NOT used. Using Miss or Mrs to address a woman is not appropriate, as you don’t know whether she’s married or not)
Informal
(note: salutations are followed by a (,) comma, exception: ’To whom it may concern:’)
Formal
Semi-formal / Informal
Formal
Informal
Formal
Informal
Formal
Informal
Formal
Informal
Formal
Informal
Formal
Informal
Formal
Informal