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Authentication; Failed access to server since TB update.

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Since recent update of Thunderbird cannot connect to Server; am instructed to change 'authentication; tried all options without success. i.e using Account Settings > Edit SMPT. What can I do? [Windows 10 - Plusnet/Force9.]

Des

Since recent update of Thunderbird cannot connect to Server; am instructed to change 'authentication; tried all options without success. i.e using Account Settings > Edit SMPT. What can I do? [Windows 10 - Plusnet/Force9.] Des