Formal:
For formal occasions, use proper titles, formal greetings (e.g., “Dear Mr./Ms. Last Name”), and a more formal tone. 

Informal:
For casual notes, you can use nicknames, casual greetings (e.g., “Hi”), and a more relaxed tone. 

Spelling:
Always spell out words in full when writing to someone of a higher social standing. 

Avoid Abbreviations:
Avoid abbreviations unless they are common and easily understood.

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Posted in: Etiquette, Social stationery etiquette