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- Incorrect Password. As well as checking the password is correct, ensure no special characters are being used such as ampersand - these can sometimes cause this error.
- Incorrect Username. Double-check that the username is the actual mailbox name as setup on the mail server, and not the alias or email address, which may sometimes be different.
- Authentication not required. The server is not expecting a user name and password, but we are sending one anyway (the gui doesn't allow you to not set a password). To fix this, add the property mail.smtp.auth=false to Properties.
- Cannot authenticate. In some cases, the details are correct but the server is refusing to allow authentication to take place, due to the authentication protocol being used. For example, this error is received when attempting to connect to Google Mail, because Google requires the username and password to be supplied in an OAuth token.
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{"serverDuration": 327, "requestCorrelationId": "42c7090bcd304e34838e6e27fee7c143"}