[edoceo]

Nice, I built an internal tool like this once. Love what you've got here. IME the next priority is supporting alternate providers to SG (and I see from the thread it's on your roadmap).

Another option for the SMTP part is using an upstream mail provider perhaps https://mxroute.com/ works for folks.

Oddly, I've had pretty good success with sending from my own Postfix+OpenDKIM based infrastructure for many years (in Linode). I suppose it's mostly because my volume from that box and those domains is so low and is primarily transactional rather than news-letter like things (I send service announcements maybe quarterly). I mentioned it elsewhere in thread but I like Postmark for those newsletter & drip-campaign stuff.