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SMTP Error (451): Failed to add recipient "user@domain.tld" (Temporary local problem - please try later)

Jefferson Sherlin
  • Updated

Symptoms

You receive the following error when attempting to send an email from webmail.

SMTP Error (451): Failed to add recipient "user@domain.tld" (Temporary local problem - please try later)

 

Description 

This issue occurs when the server is unable to perform DNS lookups.

 

Workaround

  1. Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.
  2. Open the /etc/resolv.conf file in your preferred text editor.
  3. Add Google's public resolvers at the beginning of the file. 
    nameserver 8.8.8.8
    nameserver 8.8.4.4
  4. Save the changes and exit the editor.

Please note that you should contact your network provider to determine what nameservers should be used in the /etc/resolv.conf file.

 

Additional resources

What nameservers should I use in my resolv.conf file?

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