Bottom line: you should use a personal email and give your customers the chance to respond if they want, because…
Setting up emails like this can be done with good lifecycle email marketing software that allows you to track your customers’ actions and trigger a series of emails to users who look at product category (cameras, for example) but do not checkout.
The web is a powerful place, and you are now able to access and use more information about your customers than ever before.
Next time you send out a promotional newsletter I’d recommend having at least two segments: Customers that have purchased before and new customers.
Use simple segments to change your offer in each email you are sending and, ultimately, improve your profit from this campaign.
For example, why not offer new customers — who have subscribed but never bought — a discount.