Try going into Settings -> Applications -> Manage Applications -> select the HTC mail app (I'm doing this from memory as I don't have my Eris with me at the moment, but look at the amount of Cache this app is using and it should be somewhat in-concert with the 86MB value you mentioned) -> Clear cache (notClear data).
The solution would be obvious if there was an obvious way to delete the data. However, the button that is there for many of the other programs, is not for this one. Completely blank. There seems to be no way to change this. ARGH!
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