Since SendLink provides a GUI rather than a programmatic approach to set up SMTP, the one place where you may encounter errors is during authentication. However, you can sometimes experience this error due to a poor network connection.
First, connect to SuddenLink using a fast, reliable internet connection.
Then, ensure to provide the correct SendLink username/password. If not, you can try resetting your SuddenLink password and setting up the SMTP connection again.
However, if none of the above works, try resetting the web browser cache or using a different web browser to access SuddenLink.
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