Email routing not working from Outlook sends

I have several subdomains, all part of one domain, and all with associated routed email addresses. When I send an email to any one of these emails from a Gmail account, the email is successfully routed through Cloudflare to the specified destination address. However, if I do the same from my Outlook account, none of the emails make it to the destination inbox. Cloudflare does record the emails as both successfully received and forwarded, but as I said, they are not delivered to the destination address.

Can anyone offer any insight into what might be causing this issue?

May I ask about your SPF, DKIM and/or DMARC records, if they exist? :thinking:

Are the emails like [email protected] and/or [email protected]?