@andy.i this is the solution!
I setup postmark, and emails were still not landing in outlook inboxes. This is frustrating that S3 links are being seen as phishing attempts
Thank you, you are a gem.
For those struggling to get the naming issue correct with uploading images onto root, check this out - http://forum.bubble.io/t/hosting-files-in-the-root-directory-not-working/246556/3