Hi, I work on this team at Cloudflare. We've been sending email for years via our free email routing product and email sending is built on top of the same infrastructure, code and knowledge.
I hope you've (your org) been able to curate something resembling higher level contacts with Microsoft. They seem to be the single largest email provider that consistently has deliverability issues.
I hope you've (your org) been able to curate something resembling higher level contacts with Microsoft. They seem to be the single largest email provider that consistently has deliverability issues.