Hi Boni,

I never use Yahoo so I'm not sure what problems you would run into. Been awhile since I even looked at something like this, but... I think photoshop will put out an html file for whatever you make in it, including the html code. Perhaps another option is to simply make it an image and send that. MS word will save as HTML, but then you get into the issues you may be talking about. The other option, pretty well accepted worldwide is send a PDF.

Good Luck