I haven’t heard of Feedblitz – just looking at their website now. Appears that they’re a Feedburner replacement specialising in RSS-to-email (sending your blog subscribers an email about latest posts). Their pricing looks a bit steep (considering Feedburner was free) – so I’d probably choose Mailchimp or Aweber over them? That way you can message up to a few thousand people free of charge.
Activation: A new user creates an account but, they do not use your product within the first 7 days. Create an “activation” campaign that sends an automated email with their login information, steps on how they can get started and include a video demonstration for additional support. You can also invite them to a one-on-one meeting to walk them through the product and answer any questions they may have.
"The main email applications are copy writing and dynamic content selection. The latter providing the best in personalization. The aim of providing the right message for each person will never change it’s the method to achieve it that changes. This trend is most relevant to brands with relatively varied audiences or many and diverse products (SKUs).