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Behavior:
When attempting to send a test email from the Mail Service configuration, the following error message is thrown, 

"5.7.0 Too Many Unauthenticated commands."

Solution:
When accessing a Mail Service configuration, if you immediately try to send a test email, it will fail because the password has not been entered. The password textbox will be empty, which makes it necessary to enter it again before sending a test email.
Once the password has been entered, select Save then you should be able to send the test email.

KBA is applicable to both Cloud and On-Premise Organizations

This article is valid for DocuWare versions: 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 7.10, 7.11, 5.7.0 Too Many Unauthenticated Commands, Mail Services