Only thing with any attachment though it that the blast would take lot longer right? (sending to thousands of people), and some folks wont accept attachments due to fears of virus, no?
There is no foolproof way to accomplish what you are attempting with either a formatted email message or an attachment and you will always be subject to limitations imposed by individual recipients and/or their host ISP.
However I receive several newsletters and while none of them are a big or as complex as you are describing, a common solution that is used to work around the problems is a one page email that is essentially a splash screen or table of contents with a link or links to a web site where the newsletter content can be viewed as an HTML and/or downloaded as a PDF. There are advantages and disadvantages to both formats, but FWIW my personal preference is PDF as it will display exactly the same way on any computer whereas HTML can be subject to lots of variables beyond your ability to control. Additionally this offers the added benefit of conveniently providing your readers with access to past issues of your newsletter.
