Hey there,
1- Your users are getting the newsletters in the style and language they are have set on your site. There currently isnt an option to override the newsletter or the email style settings (though I think it could be a useful option). I would suggest putting it as a feature request in the bug tracker so I don't lose it
2- This is why
GAZ
has its own header templates... its not just a matter of losing the rollovers, it is a matter of many email reader totally stripping out some images even after they request to download them (i.e. gmail and hotmail stripping out css external images).
The best strategy here is to attempt to suplicate the looks as best as possible in the
GAZ
templates with as few external images in the CSS as possible. Even then, I will use the inline style tools to use similar background colours as the css background images just in case they dont get downloaded.
Life would be much easier if email readers had standards, but creating an email generation system is 100 times worse than creating a cross browser web page
Hope this helps hed some light for you