What issue are you experiencing that has raised this question?
FWIW an email client usually determines this but should it not do so then either leaving the setting blank or set to /
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Hi, Thank you for your response. I couldn't seem to get my Mac Mail to work it just kept telling me This Account already exists? I didn't understand but then I found an Apple help suggesting delete the account and then add it again. I did this and it seems to be working now.