Code popping-up when replying

When I reply (and reply all) to a mail I get the code at the top of my mail eg:

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When I forward I get the normal text eg:

Van: "XX YY" <XX.YY@ZZ.com>
Datum: 17 maart 2009 10:43:12 GMT+01:00
Aan: "DD QQ" <DD.QQ@zz.com>,
Onderwerp: RE: Chrysler Neon: Movies

This is when I put the preferences in "plaine text" in stead of RTF.

Is there a solution?
W.