I have same problem. Error message 'Connection to server mail.tpg.com.au was reset' Rang support and they advised other Thunderbird users have same problem and no solution as at 27/7. I applied the following changes and it WORKED: Server settings > Server name= mail.tpg.com.au > Port = 110 > Connection security = None > Authentication method = Password transmitted insecurely Outgoing Server > Port = 25 > Connection security = None > Authentication method = Password transmitted insecurely BUT I am concerned on the reference to 'transmitted insecurely'!!
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