By British English, Exclamation marks

Dear Mr. Ericson! Do not end a salutation with an exclamation mark. In US English use a colon :, in British English use either a comma or nothing.As you are already aware, Football Club “Shahter”(Donetsk) is about to build a new 5-star stadium, which meets all official UEFA requirements and will...

"You're a star!" is fairly common in both emails and spoken British English. There are some constraints on its usage, though: 1. It's mostly used by people under 40. 2. It's very seldom used by one male to another male. 3. It's characteristic of office life, rather than home life. (It would...

Well, both or neither, really, because "rules" governing punctuation aren't really "rules" in the sense that rules govening nouns, verbs and adjectives are rules. Punctuation "rules" vary considerably, often from publisher to publisher, or from newspaper to newspaper. I can tell you that...