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When addressing someone in an email (I understand grammar rules are pretty loose in this medium), should the sentence after the colon start with a capitalized letter? For example:

Example A:

I'm going to bring my car. David: What about you?

Example B:

I'm going to bring my car. David: what about you?

If a colon is the incorrect punctuation used in this scenario, please feel free to correct me.

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up vote 3 down vote accepted

There are actually 5 examples of colon usage in your question. All three that have the word "example" before them are Ok.

Here is a short list of rules on how and when to use colons.

But the punctuation after the name "David" should be a comma instead. This is because you are using "direct address." This is also true in business writing and an email.

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Great! Thanks for the link as well. – Ray Jul 16 '12 at 3:29
No problem. :-) – Cool Elf Jul 16 '12 at 3:34

I wouldn't use a colon here. It suggests that David is the speaker of "what about you?" A comma seems to me to be the correct punctuation. If you put "David" at the end of the sentence, it would have to be "What about you, David?"

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The example of putting "David" at the end of the sentence makes sense! – Ray Jul 16 '12 at 3:29
+1 to this comment for explaining the potential confusion resulting from the colon. – D Coetzee Jul 16 '12 at 4:36

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