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There are few faces that are "cross-browser" friendly. Some of the serif faces include Courier, Courier New and mono. In order to make sure your viewer is even seeing close to what you want them to see, use several faces in your tags. Two examples (you would put the < > brackets on both ends):
font face="Courier New, Courier, mono"
font face="Courier, Courier New"
You can also just use "mono".