My best advice would be to try an actual transactional email service. A while back I was experimenting with this... Absolutely couldn't get past spam despite al

My best advice would be to try an actual transactional email service. A while back I was experimenting with this... Absolutely couldn't get past spam despite all the right settings. Then I tried sendgrid. Worked like a charm without any domain configuration. In fact, it would let you use a completely made up domain and it'd still work (because you're really using sendgrid's domain for reputation, yet most UIs will still show the other domain or both)