Has anyone set up cloudflare’s email routing feature w/ Exchange Online?
Is it possible to have cloudflare host the MX records for my custom domain (which are required for email routing to work) and yet still use Exchange Online for sending outbound email from that same custom domain? Including using DKIM?
Near as I can tell, Exchange Online doesn’t like not being authoritative for the MX records, but I’m hoping I’m overlooking something.
Exchange Online doesn’t have any problems with any valid MX. You will be presented with an informative notice that your MX records do not match those provided by Microsoft, but as long as the MX configuration is valid, it will work.
I can assure you that the likelihood of having a valid reason to attempt to combine Cloudflare Email Routing with Exchange Online is nill. Nothing good can possibly come of it.