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cannot read att.net on new thunderbird.

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My computer crashed so I replaced the Kubuntu with the newest version. This also had the newest Thunderbird. After loading my Thunderbird I found that the gemail emails worked fine, however the att.net would not work. All of these work very well on the older Kubuntu but the newest version does not work with the att.net. I think this is the problem with the newer version of Thunderbird. How can I change the Thunderbird back to the older version so it will work. Any help will be appreciated. Can I revert back to the older version of Kubuntu which will have the older version also for the Thunderbird and fix the problem.

Thanks Glenn

My computer crashed so I replaced the Kubuntu with the newest version. This also had the newest Thunderbird. After loading my Thunderbird I found that the gemail emails worked fine, however the att.net would not work. All of these work very well on the older Kubuntu but the newest version does not work with the att.net. I think this is the problem with the newer version of Thunderbird. How can I change the Thunderbird back to the older version so it will work. Any help will be appreciated. Can I revert back to the older version of Kubuntu which will have the older version also for the Thunderbird and fix the problem. Thanks Glenn

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Did you generate a new secure mail key and use that in TB in place of the account password?

https://www.att.com/support/article/dsl-high-speed/KM1010523/