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PERM_FAILURE: SMTP Error (state 13): 550 unknown user

Make sure your files: /etc/virtual/domains and /etc/virtual/domainowners are not blank/empty. To re-build these files, follow the instructions given in these two articles:

Also, click here to read this thread posted in DirectAdmin forums.

If none of the above helped, login to your account and submit a technical support request and one of our engineers will fix this problem for you. Thank you

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