Emails bouncing back as undelivered

I have a client that is trying to send out an e-mail to a specific e-mail address but it bounces back saying the e-mail could not be delivered and this is a permanent error contact your ISP (I also believed my client mentioned something about too many attempts
or something along those lines) Does this mean my client might be black listed?  I don't have the exact error msg in front of me due to not having the computer myself but I am wondering if anyone has seen this before, or something similar, and what
steps have been taken to resolve this issue.
Thank You

Hello,
Any update on this issue? Please don't hesitate to post back.
In addition, please try sending an email to the specific user from webmail to see if it sends successfully.
Please also try removing the recipient from your contact folder and deleting the autocomplete entry for the recipient, and then try testing the issue again.
Please let me know the result.
Regards,
Steve Fan
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

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