A friend of mine uses both an exclamation mark and a comma in his letter salutations, like so:

Hi George!,

I have never seen this before, and was wondering if it's grammatically kosher. Thoughts?

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    There are no grammatical rules involved here; rather it is a matter of style. – Elberich Schneider Sep 5 '12 at 19:40

The first thing to say is that punctuation isn't grammar. The second thing to say is that punctuation is there to help the reader and if it doesn't do that it serves no purpose. In your example, either the exclamation mark or the comma would be helpful. The two together most certainly are not.

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  • Hence, not grammatically kosher, but stylistically treyf? – Daniel Harbour Sep 5 '12 at 22:28

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