Has anyone in the CiviCRM community considered integrating CiviCRM with SendinBlue (https://www.sendinblue.com/)?
Not as far as I am aware (and a google search, which I am sure you have done) does not bring up anything significant.
Aside: I'm interested in developing marketing automation tools for CiviCRM. Similar to sendinblue and dotmailer and would be happy to chat further with you if you're interested (email@example.com).
I've been using Sendinblue for a while. Not using any extensions, just plugged in the SMTP credentials and emailing away