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Email Marketing: Sent Does NOT Mean Delivered
http://cdemails.com/articles/6109/1/Email-Marketing-Sent-Does-NOT-Mean-Delivered/Page1.html
Marketing Profs
MarketingProfs.com is a rich and trusted resource that offers actionable know-how to help you market your products and services both smarter and better. Entrepreneurs, small-business owners and marketers in the world’s largest corporations make up its 318,000 subscribers, making it the largest in its category.  
By Marketing Profs
Published on 08/3/2009
 
A recent survey of more than 180 marketers from around Europe found that many don’t understand if their email is really making into the inbox or if it is being junked or lost in space. Email marketing firm Return Path shows that marketers have not been quite diligent in making good on the definition of delivered.