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Does Your Email Need a Frequency Adjustment? Ways to Tune the Dials
http://cdemails.com/articles/5982/1/Does-Your-Email-Need-a-Frequency-Adjustment-Ways-to-Tune-the-Dials/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 07/21/2009
 
by Karen Talavera - What to send, and how often, are the top questions facing any email-marketing-program manager today. Yet, all too often, frequency for the sake of frequency trumps relevancy in this channel. It's a classic catch-22: Email works so well that it runs the risk of undermining its own potential.