Comma or full stop?

[Tom]

[Yankee]

Hi Tom

I'd say either a semicolon or a full stop/period would be appropriate.

Amy
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Amy
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ESL teacher, translator, and a native speaker of American English

[Torsten]

Hi Tom, it would be great if you could post your question in the appropriate thread. This will make it easier to make changes and keep track of them:

Change vs. shift
http://www.english-test.net/forum/ftopic12701.html

Thanks,
Torsten
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[prezbucky]

With a comma, it's a run-on sentence.

This requires a period or a semicolon.
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Billie Jean is not my lover. Hee.