Check message appearance in the preview pane. Can recipients make a quick "open" decision based on content showing in the preview pane? If not, consider reformatting the message or adding teaser text at the top that highlights key message content.    

Include alt tags. Although many email services and email clients don't display alt tags when images are disabled, it's always a good idea to include them. Regardless of why, if images haven't loaded, properly written alt tags may provide the recipient with enough information on which to act.    

Use text-based ads. Publishers carrying server-based ads might consider including more text-based ads. Coincidently, some publishers report text ads deliver higher CTRs (click-through rates) than image-based ads.    

Create text versions. With HTML email so popular, text versions tend to be neglected. Yet recent email client changes mean users have an increased ability to select which default format they prefer. A strong text version ensures you still reach users, regardless of format preference.    

Include more text links. If your email includes several key linked images, consider adding text-based links above or below the image or appropriately placed in nearby copy.    

Focus on CTRs and conversion rates. Don't obsess over open rates. Monitor CTRs and conversion rates and focus on maintaining or increasing them.

To read more about EmailLabs' perspectives on Image Blocking, visit: www.clickz.com/experts/em_mkt/email_delivery/article.php/3413471

Source: EmailLabs