In fact, html-documents never CONTAIN images, once saved, but only a link. The program you use to VIEW it (be it a browser or an html-editor) finds it run-time from the source. So I don't expect a problem as long as you save the edited version again as html-file before sending it.
With Word-documents (.doc in stead of .htm) things might be different. But as you specifically mention an html-newsletter, that behavior isn't relevant.
Let me add that I find MS Word to be an inferior html-editor. This is not the place to recommend another one, but there are quite a few, some if them free and still good. It seems you've chosen the wrong tool for your purpose (like in "I find it difficult to turn this screw in using my hammer or saw" or "I can't use SQL in MS Word".
How do I stop word form importing an image that located on a remote server when I open an html newsletter for editing?
I want to be able to edit and forward (via send to) the newsletter without word importing the image and sending it as on as an attachment (I want to keep the image on the remote server).
I'm using Word 2002