Mailercloud is an interesting product, it offers a high degree of personalization and nice form builders. They currently offer the marketing platform and transactional mails are not included. I can live with that, but the fact that you still don't offer a double opt-in is a clear no-go for me and that makes me think of you as a European company. It was wished more than a year ago as mandatory and such a feature has to be offered today. Unfortunately I saw this too late, GDPR without double opt-in is a no go.