I have just fallen into that trap :(
I created a page containing 12 images and a tabulated text using inline CSS for styles (total 120K (what was I thinking?!))
Big mistake and I am not afraid to admit it! From the 1200 users I sent it to 24 wrote back at their annoyance that I had crashed there e-mail client. So I have no idea how many othjers I have p*ssed off in the process.
I tested the HTML e-mail on Hotmail, yahooo, Outlook, Oulook express and eudora using Win2K, XP and an IMAC. I had no problems but this happended nonetheless - I will not be making that mistake again! - use text and links THATS ALL!