How do I stop double spacing in my email text?

I've tried everything but my email text still double spaces. All the
format
settings say single spacing. Is it a "Word setting"? How do I change it
down
to single spacing if all the format settings already say single
spacing.
If
its on HTML or Rich Text, it's double spacing. If I change it to plain
text I
lose my stationary but it goes back to single spacing. Do you have any
suggestions?
Thanks,
Rob