MailChimp blog provides a quick tip to help you ensure that your background image or color appears in browser based email applications. Here is the tip:
• Set a big table that 100% wide, then specify your background color or image there.
• You can use the attributes “bgcolor=” or “background=”
• Then post your actual newsletter code inside the table.
Check out MailChimp’s “HTML Email Design Guide” pdf.
eINFO – a collection of articles and studies about email marketing.