I'm not sure this is useful (I'm not a tech guy in any way, just interested in the discussion) but for our stack we use third-party tools, and we really like th

I'm not sure this is useful (I'm not a tech guy in any way, just interested in the discussion) but for our stack we use third-party tools, and we really like them: SendWithUs for transactional emails, Gorgias for email templates, and RocketBolt for tracking the emails.