This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(179.20000000000002, 12%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EI%3C/text%3E%3C/svg%3E)
Hello
Please i need your help on this issue.
Users receive complaints from their contacts that all messages sent to them are bouncing back and are not deliverable to our domain '
Have you asked those contacts to try and send you an e-mail? Does it bounceback on your e-mail address or only the specific contact in your organization?
You could try a bounceback checker like:
To narrow down this one, I want to confirm with you that which mail server that you used and which mail server that send emails from?
Which NDR received when delivery emails failed?