I never thought about that. I only see that hosted newsletter software is too expensive. My requirements: - Send maybe 2,000 transactional emails per week

I never thought about that. I only see that hosted newsletter software is too expensive. My requirements: - Send maybe 2,000 transactional emails per week - Send a few hundred autoresponders ("newsletters") per week - Once a year or so, send 70,000 emails to all users who signed up I neither want to have an email list with 70,000 people in it where only a fraction regularly receives an email. Nor do I want to pay several hundred bucks for the occasional broadcast to the entire user base. And also: I won't use non-German newsletter providers for privacy reasons. This is probably way too strict and kind of an illusion, but that's just how I run my business.