Provisioned a new Subdomain for email sending in Marketing Cloud using the Shared IP option. Having issues with emails being flagged as an external sender for the client's outlook with the links not working (blocked). The sends are working fine on gmail and other platforms with the links working as well.
What is the potential solution? Shouldn't this not be an issue since we are using Marketing Cloud's shared IP's which should bypass the need for an IP warming and since our sends are very limited and will never reach the threshold needed for a dedicated IP.
Any suggestions/solutions appreciated.