i am an experienced copywriter with more than 50 websites and newsletters to my credit. i can show some of my examples when we finalize the deal. meanwhile you will need to host the contents like images, flash etc. on your website and mail the html page with text. once your client receives the newsletter, he will receive the html page with images etc downloaded from the server.
as an example, below is the punchline i wrote for a beauty parlour:
Put your best look forward
Beautiful choices. Beautiful Surprises.
Exotic touches for the contemporary lady.