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Since update to 128.2.2esr, Thunderbird gets stuck at "Checking mail server capabilities"

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This is a known problem from past versions, but none of the old fixes seem to work this time. So probably a new cause. Please help!

This is a known problem from past versions, but none of the old fixes seem to work this time. So probably a new cause. Please help!

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Please direct follow ups to scott168's question link.