This is what your looking for.
The Internet Mail service under Windows Messaging allows a user to choose
US ASCII or ISO 8859-1 character sets. The reason the difference is
important is that whether you are using Messaging or not, often times "="
signs appear at the ends of message lines. If you or another user you
correspond with routinely experience this problem, there are three possible
ways to eliminate the "=" signs at the end of lines. First, change the
character set from ISO-8859-1 (the default in IMN) to US ASCII. Although no
such setting is immediately or obviously available in Internet Mail and
News, there is a String Value entitled "Default Charset" in the registry
for both the News and Mail folders located under HKEY_CURRENT_USER \
Software \ Microsoft \ Internet Mail and News. You may edit this String
Value and insert US ASCII and IMN will function just fine, with a couple of
qualifications. Under ISO-8859-1, you get to select different fonts and
users can see colored text when you are reading if you have set it that way
under Mail | Options | Font. Using US ASCII, the only option that Mail
accepts, even if you select a different font and color, is Arial 10 and the
color of read text is black. Second, go to Mail | Options | Send | Plain
Text | Settings and select UUEncode for message formatting. Finally, again
in Mail | Options | Send | Plain Text | Settings, decrease the wordwrap to
less than less than 76 characters.
original works from http://home.sprynet.com/sprynet/edm/
> When I use Outlook (from Office 97) to send email to people who do
> not have MIME support, the end of each line that has been automatically
> wrapped by Word ends with an "=". Lines which have not been wrapped
> (i.e., those which I hit a "return" to end) do not have this code there.
> How do I disable this annoyance?
> chance to read news very often.