How to write business letters?

[SENDER'S NAME]
[SENDER'S ADDRESS]
(optional[SENDER'S PHONE]
(optional[SENDER'S E-MAIL]

[DATE]

[RECIPIENT W/O PREFIX]
[RECIPIENT'S TITLE]
[RECIPIENT'S COMPANY]
[RECIPIENT'S ADDRESS]

(Optional) Attention [DEPARTMENT/PERSON],

Dear [RECIPIENT W/ PREFIX]:

Re: [SUBJECT] [First Salutation then Subject in Business letters]

[CONTENT.]

[CONTENT.]

[VALEDICTION (Sincerely, Respectfully, Regards, etc.)],

[SENDER]
[SENDER'S TITLE]

Enclosures ([NUMBER OF ENCLOSURES])

cc: [CC RECIPIENT], [CC RECIPIENT TITLE]
[CC RECIPIENT], [CC RECIPIENT TITLE]

Useful links for writing business letters :