How to block bounce back emails

Products

• Messaging Gateway

Issue/Introduction

Need help to block no-reply emails sent via SMG. Some emails are bouncing back and failing to reach their recipients.

Environment

SMG 10.8 10.9

Cause

Bounce back messages failing to reach recipients and stay in the delivery queue.

Resolution

For the bounce-back scenarios we recommend to configure and enable Bounce Back Prevention technology to eliminate non-deliverable receipt (NDR) messages that are a result of redirection techniques commonly used by spammers.

For more details please check our:

KB article: Defending against email bounce attacks

Techdocs:  Defending against bounce attacks

 

You can also create a content filter to block them by specify conditions such as matching the sender email address. You will need to modify the policy based on the bounce-back emails received.

Example: