Sendinblue is the best existing email marketing software!
"I was looking for a service which combined everything I needed. I was using Mailjet to send transactional emails, Sendwithus to create my newsletters, and MailChimp for email marketing. Sendinblue has everything you need under one roof! It manages transactional emails, email marketing, and newsletter editing. But also: sending and receiving text messages, marketing automation (which works very well) and the guys on technical support are great."