Unfortunately, it may well be that the SMTP server is blocking the communication as seen with AOL, Gmail, Yahoo, and others alike. Some have been able to use the Gmail app password feature and set up 2-factor. The shrinking of the password is just a security measure to obscure what it really is. Another thing that could be the case is the TLS and SSL versions, sometimes you can get lucky and there is a newer firmware but if the firmware does not have the latest current one being used you will find yourself in the same situation.
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