Not related to them in any way, but I have used Postmark in several (larger and smaller) projects and have always been very happy with them. They are not dubiou

Not related to them in any way, but I have used Postmark in several (larger and smaller) projects and have always been very happy with them. They are not dubious at all, have reasonable pricing, good documentation, responsive support and are very open and honest about their operational status.