An unknown error has occurred. Account: 'Test Mail,' Server: ',' Protocol: SMTP, Server Response: '501 Invalid Print

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Try changing the computer name for this error.
- Go to Control Panel | Network. (Install Client for Microsoft Networks if it is not listed).
- After that is done, in Control Panel | Network,
- click on the Identification tab
- and change the computer name to something short,
(Suggest the name be simple ASCII, no space characters, no special characters, and do not include the domain name of your ISP)

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