I receive a lot of newsletters and communiqués, some of which I even signed up for.<p>So, I don't know what designers use to receive e-mail, but here in the non-designer / non-linux world, Outlook is pretty popular.
Now, Outlook - at least all configurations I have seen, has pictures via HTML disabled. I have sampled a few IT departments only, of course, but I feel like this is probably a pretty common policy.<p>So let me tell you:<p>Your picture banners, your "rounded corner buttons", your main engagement centerpiece that's just a picture ...
it all ends up being one of those nice 90's type beveled empty box we remember from surfing with IE and ISDN.<p>This may be a shock, but it really doesn't make your important newsletter look any better. So, if you are not specifically going for nostalgic "bad modem connection" look and feel, maybe ease off the HTML pictures a bit, okay?