Character encoding issue when replying in plaintext to html email

[simonnewton]

Binary package hint: evolution-mapi

ubuntu 9.10
evolution 2.28.1
evolution-mapi 0.28.2-0ubuntu1

If i reply in plaintext format to an email which was HTML formatted, everything looks fine in my 'sent' box, however the recipient of the email sees character issues.

In the actual reply my new text looks fine, however in the quoted section of the email I replied to (eg the lines beginning with '>') some lines have had '=20' appended (though oddly, not all lines):

-----Original Message-----
From: Simon Newton
Sent: Thursday, April 08, 2010 10:22 AM
To: xxxxxxxx
Subject: Re: Re: xxxxx

*REDACTED*

Kind Regards
Simon

> =20
> ______________________________________________________________________
> From: some user=20
> Sent: 25 March 2010 20:29
> To: Simon Newton
> Subject: RE: Splunk
>=20
>=20
> =20
>=20
> Unfortunately the license will not break up that way.
>=20
> =20