CKEditor uses CSS-properties for aligning images with text

Hi,

I'm using the ckeditor for editing the content of newsletters. Unfortunately, most email clients don't understand most CSS properties and ckeditor is using them for a lot of things.
The old fckeditor used e.g. for aligning an image left to a text the attribute "align" of the image tag and not the css-property "float".
Does somebody know how I could change this function or do I have to duplicate the image-plugin-code and change the way it works?

Thanks for the answer,
Michael