W3/WCAG Guideline Outlook 2007 html messages

Hello,
 
Does an html body of an Outlook 2007 email message need to meet WCAG 1.1 to comply?
 
The message has images with no text alternative when you open and read the message with Jaws 10.
 
If you open the message with a web browser, alt h-x-v the images have text alternatives in the browser.
 
Does this meet WCAG 1.1, or is there something the developer of the email body can do to resolve? If the html email body can display
text alternatives directly in Outlook 2007, do you have a resource that explains how to resolve? 
 
Thank you,
 
Bill