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Someone please help clarify a discrepancy I have been having with a coworker.

When writing business emails, is it correct to use the greeting “Good Day” (with the “D” capitalized) or “Good day” (with a lowercase “d”)?

Any advice on this topic would be GREATLY appreciated!

Thank you!
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It depends on where you place it. If it's part of the subject, then you may capitalize it. If it's in the body of the letter, then it's better to use a lowercase "d". "Good day" is written just like "good morning, good afternoon, and good evening".
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Thanks for the reply!

Actually, it’s the salutation/greeting, so it’s neither part of the subject or the body.

What is the correct, colloquial style for today’s business communications? Is it “Good Day, ……” or “Good day, ……”

Thank you!