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Complete the Options section as required: Solution 1: Confirm the recipient's email address It sounds too simple, but the wrong email address is the most common issue that causes 5.1.x errors. Recipient It's frustrating when you get an error after sending an email message. Seems like an odd way to talk about email, either you want it or you dont. Mimecast Navigate to Administration | Message Center | Bounced Messages. Mimecast's SPF record check can also validate any updates you applied to your record. to verify that your email address isn't in their block list. Log off, close your web browser, and open the mailbox again in Outlook on the web. I logged a support ticket with Mimecast, but still no reply. SPF Record Check From my mail logs: Text They don't seem to notice when their IP addresses get blocked, and don't try again from a different address. Recipient A problem occurred during the delivery of this message to this email address. Using Alias Email Addresses We create personal email archives based on email addresses. It seems to be squeaky clean. Note: The Rejected message queue displays by default. To configure a Blocked Senders policy: Log on to the Administration Console. To troubleshoot failed delivery, you can view information about the message and the reason for the bounce, and use this to address the cause and resend the message. In the page that opens, select Use the light version of Outlook on the web, and then click Save. 5.1.0 - Unknown address error this looks like it could have inputted by the CES: best way to find out is try to find this email inside your message tracking, if it comes in as a fresh new email - then it's an NDR generated by another server, if the CES generated this NDR then you would see it in the DCID portion of the original email.