This doesn't seem to be an Excel issue, or even an issue relating to how one might add a prefix to some data, since you already know how to do that. Rather, it seems more likely to be a problem of formatting data according to gmail's requirements. From what you're describing, it seems you are prefixing the data instead of naming the column heading appropriately.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]