Mail Flow - Frequently Asked Questions

This guide provides information to frequently asked questions related to Mail Flow, within Cloud Gateway.

Mail Flow FAQ

Q:	When I try to send a message to an organization that uses Mimecast, I receive a non-delivery notification indicating that the message wasn't received. What does this mean, and how can I resolve this?
A:	Try the following: If you are receiving a non-delivery notification stating that the message could not be sent, check our Mimecast SMTP Error Codes page for information on what may have caused the failure. If you still require assistance, contact the recipient’s organization for further troubleshooting.
Q:	Mail that I send to Mimecast customers are being rejected as spam or are being rejected due to RBL listing. How can I avoid this?
A:	Please provide more information to our Messaging Security team through our Sender Feedback Form.
Q:	An organization that uses Mimecast is trying to send mail to me, but I am not receiving it. How can I resolve this?
A:	Try the following: Check your spam filter to see if the message was held there. Contact the sending organization’s email administrator to troubleshoot further. They can raise a case with Mimecast Support for further assistance as needed.