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Sloppy List Management Practices That Can Get Your Emails Blocked
http://cdemails.com/articles/3270/1/Sloppy-List-Management-Practices-That-Can-Get-Your-Emails-Blocked/Page1.html
Mailchimp Resource Center
MailChimp, a leading do-it-yourself email marketing service, provides tools to over 15,000 small businesses, design agencies, non-profits, restaurants, and e-Commerce organizations worldwide. Customers can create professional, eye-catching HTML emails in minutes with easy-to-use web based tools.  
By Mailchimp Resource Center
Published on 08/2/2008
 
At MailChimp, we manage over 65,000 subscriber lists, with over 75 million recipients in them. We’ve seen a sloppy list or two, and have dealt with a delivery problem or two. So we’ve learned a thing or two about how sloppy lists happen, and how to prevent them. Most sloppy lists come from ignorance, not evil. But that doesn’t make it any less stupid. So here are some stupid list management mistakes to avoid...