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While the salutation in modern UK business correspondence has no punctuation, in the US the addressee's title (Mr., Ms. etc.) is followed by a period (UK full stop) and the salutation is followed by a colon:In the UK the matching salutations and complementary closes are as follows:Dear Mr Smith -> Yours sincerelyDear Sir or Madam -> Yours faithfullyUS usage is less rigid regarding a "correct" complementary close. “Sincerely yours,” or just plain “Sincerely,” (notice the commas) are the two most common ways of closing a formal letter in the US.## Salutations and complementary closes in business emailsWhen you send someone a formal business email for the first time, you should use the same salutation and complementary close as you would for postal correspondence. It’s different when English-speakers email somebody regularly. They soon start using the first name in the salutation ("Dear David"). In the UK, various closes are used, including "Best regards", "Regards", "Kind regards" or just the sender's first name. In the US the sender usually signs off with just his or her name and no complementary close.## Subject linesIn the US the subject line normally comes before the salutation. In modern British style the subject line comes after the salutation. The subject line is normally in bold.## PunctuationIn the US punctuation is used more than in Britain. You would write in an address, for example, "Ms. Samantha L. Brown". Notice the periods (UK full stops). In Britain there would usually be no punctuation: "Ms Samantha L Brown".In modern British letter-writing style there is no punctuation at all in the address, the date, the salutation and the close of a letter (see above). The only punctuation you will find is in the body of the letter. In the US punctuation is common throughout the letter.## Spelling