Formal = formeel / zakelijk
Types of letters/ e-mails: application, enquiry, offer, complaint.
Salutation: Dear Sir/Madam, Dear Mr./Mrs/Ms. Adams,
Introduction: The reason for writing (use 1 or 2 sentences)
Body: Details of your message.
Closing sentence: I am looking forward to your reply.
Ending: Yous faithfully, Yours sincerely, Best/ Kind regards,.