Troubleshooting Kali Thunderbird GMail Send Mail Refused
This Tip Solve the Thunderbird GMail Sending eMail Failure in GNU/Linux Kali Desktops.
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1. Access Account Settings
First, Choose View Settings for this Account
Like here below: -
2. Setting Auth Mode
And Choose Outgoing Server:
Again Edit Settings:
And Change the Authentication Mode
To Normal Password: