Jeff,
I don't know of any way to fix it. It's most likely due to the extended
Scandanavian character set keyboard you're probably using (note there is
also a control character in the street name of your signature).
As an aside, such messages which feature 8 bit ASCII frequently get
bounced from some sites which have mail servers which only handle
7 bit ASCII (ie. cannot manage extended language sets). This isn't a
worry except for those on the list who wonder why you see replies to
messages you never received...
cheers
-steve
p.s. An easy fix would be to move to the USA :-)