KMail and characters sets (=20 problem)

Hi,

Some emails being sent from KMail refuse to use the char set defined.

Some lines end in 

= , and then the next line starts in 

=20

and there are a whole lot of lines with "=20" in them. 

The emails with the 'garbage' have this in the headers

MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="utf-8"
Content-Transfer-Encoding: quoted-printable

and the emails that look okay have this

MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

or sometimes a charset of us-ascii I think.

Is there anyway way to FORCE either is-ascii or iso-8859-1

What characters will make the email contain garbage ? Like wjat about quotes, 
single quotes, underlines, dashes, double equal signs, etc, etc ??

Regards,

Peter
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