Dynamic Distribution Group and external sender gets 550 5.4.1 Recipient address rejected: Access denied (in reply to RCPT TO command)

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Common Repair Steps:

  1. Write down the url or write down the url of this website.
  2. Clean up unwanted files in your computer.
  3. Clean up any junk system files like temp, %temp%.
  4. Execure cleanup utility.
  5. Clear junk from Windows settings.
  6. Uninstall any unwanted applications and store apps.
  7. Execute SFC /scannow command in the command prompt window by running command prompt as an Administrator.
  8. Check if {Internet connectivity is working fine, if the application requires connectivity.
  9. Write down the URL or bookmark it without any mistakes.
  10. Power OFF and then switch ON the computer and return to this noted page and contact technical support.

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