You're on the right track. This is the internet and you're trying to convey information, not create artwork. Your main problem is that your newsletter is created by a "designer". That it's on a Mac makes no difference at all. I use a mac and create everything I need from brochures to websites including pdf's and newsletters. The solution is to treat it as a newsletter. Just about everyone has times, arial, verdana, etc. You can still have a clear format with a sense of design and make it a smaller file. I send out a monthly newsletter and try to keep it to one page. There are many threads here about useabilty on the net. I suggest you tell your designer what you need and ask them to create the newsletter from your parameters not theirs.