There are a lot of free enewsletters out there, or ezines, as they are sometimes called, but many really don't have quality content or are just too commercial. We subscribe to a number of enewsletters that we have found offer good and useful content.
One of those is JoAnna Brandi's bi-weekly Customer Care Tip. JoAnna specializes in "customer service training programs and consulting for relationship management, customer satisfaction, loyalty and happiness." You can subscribe to her bi-weekly enewsletter in the upper-left corner of her Customer Care Coach website.