I’ve always been a mailchimp user myself, and I have to say I really like their UI but I’m always open to new options. I’ve dabbled in a couple of the other email marketing providers like Pure360 – but find them so clunky and annoying to use (despite them looking really pretty and having great templates) that I always end up going back to good old mailchimp. I haven’t used GetResponse yet, I’ll give their free trial a shot :)
As a growing business, you may also be looking for a CRM solution, and you'll find that the more advanced email marketing services have begun to crossover into CRM. It makes sense: Both types of software deal with managing and communicating with customers. A handful of these services are one-stop shops, either offering both email marketing and CRM out of the box or as add-on services.
Ask for the right information upfront: Great personalization starts way before you hit the ‘send’ button. It all starts with your sign up form. Without data such as name, company and location, you will be very limited with your personalized communication. Remember to only ask for the information you need, rather than the information you want. This is one of the ways that GDPR has impacted marketing teams.