I make it in Photoshop and slice it up for Dreamweaver.
It looks fine in Dreamweaver, works fine in all browsers and almost all mail clients. But on Outlook and perhaps a few others it looks like this:
Notice the gaps. It's doing my head in. Tried putting it in tables, made sure all the padding/spacing etc is set to zero but it just won't work.
Normally the email doesn't have the middle images (cyan and blue) and it works fine.