Use Your Emails To Build good customer relations. This is one of the most effective uses of emails, since if they are used to positively build up your reputation for service and attentiveness, you will see sales and customer retention go up. Customer service is a big buzzword in marketing circles for a good reason: people will simply go elsewhere if they believe that they are receiving better service (or value) elsewhere.
From the autoresponders that you send when clients fill out an order form, confirming that their order was received and is being processed, to the product updates you send your email list, the quality of your communications can go a long way towards creating positive customer relations. Grammatically correct, polite emails that let those who inquire know that you will contact them shortly, and provide them with contact information in case they need to reach you immediately, can be a powerful marketing tool.