Mimecast for Outlook - Bounces and Rejections

This article contains information on managing Bounced and Rejected messages in Mimecast for Outlook, including steps to view message properties, understand bounce/rejection reasons, and handle notifications for undelivered emails.

Bounced Messages

Bounced messages are those that Mimecast has accepted, but cannot deliver to the next hop or mail server. When this happens, a notification is sent to the sender of the message. Messages may be bounced due to a number of possible reasons. See the Bounced Reasons section of Bounced Messages.

You can view your Bounced messages in the Mimecast for Outlook client, by using the following steps:

1. Expand the Bounces and Rejections tab.

   If the Mimecast for Outlook client isn't open, click on the Mimecast ribbon and click on the Online Inbox icon in the Email Continuity section.

2. Click the Bounced Messages menu item.
3. Click on a message to display its properties, including:

• • The message properties.
  • Content.

Rejected Messages

Rejected messages match certain criteria (e.g. they contain a virus signature, or destined to a recipient that doesn't exist). In these instances no email data is accepted by Mimecast, and Rejected messages cannot be retrieved. With all rejections, Mimecast sends a rejection code to the sending mail server, and the mail server should forward a Non-Delivery Report (NDR) to the sender. See the Common Rejection Types and Resolutions section of Rejected and Deferred Messages.

You can view your Rejected messages, by using the following steps:

1. Expand the Bounces and Rejections tab.

   If the Mimecast for Outlook client isn't open, click on the Mimecast ribbon and click on the Online Inbox icon in the Email Continuity section.

2. Click the Rejected Messages menu item.
3. Click on a Message to display its properties, including:

• • The Rejection properties (e.g. rejection type).
  • Triplet information
  • Remote server information.