[pbhjpbhj]

This comes up quite regularly, some of us have had major deliverability problems with SPF and DMARC and DKIM all set up. There are, it appears, other factors outside of one's control -- for me it was (at the time) MS apparently wouldn't receive my email (that was whitelisted, and from a 15yo domain with < one email per week outbound to Live.com) because a ip4 address of a server (not the one I was using) currently hosted by my hosting provider had previously been used for spam. There was no efficient way for me to move hosting provider and know that the same situation wouldn't be true, so I signed up for a new @live.com address and send emails to MS domains through that from my MUA (Thunderbird).

At that time MS had a third party that managed this, you could pay them to do something that would basically get you whitelisted; but this was for an SME and the cost was prohibitive for the potential benefit.

If you moved server on AWS presumably you'd have to go the same route again - who did you contact? - would you be 100% confident you'd get whitelisted?