| http://www.w3.org/ns/prov#value | - Just as retailers can overwhelm customers by sending e-mails too often, they can also err by sending with too little frequency. ???Retailers don???t want their customers to forget who they are by letting too much time pass between the welcome message after they opt in and the next message,??? says StrongMail???s Deutsch.One best practice is to let consumers know what type of frequency they can exp
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