Error on Communication Settings in Management Console

Problem Statement: 

Error coming in Communication Settings window with Test Email.

Error: The SMTP server requires a secure connection or the client was not authenticated.

The server response was: 5.7.57 SMTP; Client was not authenticated to send.

Propose Solution:

Please check the below information to solve the issue.

1: Make sure the Server Port number is correct.

2: Need to update Allow Less Secure App setting to: ON, need to enable this feature in configured account.

Please refer to the screenshot below   ( for GMAIL account configuration) 

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