Topic
In some cases Mimecast might block mails from the K2 account (KUID@onk2.com) on K2 Cloud. Chances are this is a configuration issue on the Mimecast implementation.
Instructions
To verify K2 Cloud DMARC Settings the following links can be used.
https://dmarcian.com/dmarc-inspector/
https://dmarcly.com/tools/dmarc-checker
Additional Information
Results: