Although images are great for adding interest to your emails, how your customer may receive and view the email should be considered. Many email carriers, including those like Gmail and Aol Mail, automatically block images unless if the user accepts images from the sender, which makes all the hard work you spent perfecting images and graphics on your template sometimes go by unseen.
Because images do not always appear on emails, you want to make sure that your email still has meaning without images. Images can be great additions to your email, but you do not want to put the bulk of your message or text in the images. Without images, you still want your email to tell your customers what is most important, i.e. the special promotions, deals, or products you are offering.
Of course, a great way to let your images be visible to your readers is to remind them to add you to their address or contact list so that your images will always be visible. A sure-fire way to test to see if the email is clear without images is to send a test email to preview how it looks. Although images can add a lot of visual interest to an email, make sure that your overall message will still shine through.