I have had a horrible time getting this to work with dokku/docker, etc. after a few days of wrestling. Once "up", a couple of pages would not render for me at all. So I moved to mailcoach (early days, just being honest. mautic was too heavy, mailtrain seemed dated). I am trying to move away from projects with a small number of developers; it's too hard on all involved. I greatly admire the work and overall generosity of the offering however.