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Thunderbird 91.0: Error generated when setting up local IMAP accounts

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Thunderbird 91.0 64-bit on Linux Mint 20.2 Uma.

Connecting to gmail email accounts went fine, but setting up two IMAP accounts on a locally-hosted server resulted in the error message in the attached picture. This was after the config was greenlit/tested as OK.

The workaround was to select 'Advanced settings', which announced that the account would be created even if the settings weren't correct and then closing that screen.

Thunderbird 91.0 64-bit on Linux Mint 20.2 Uma. Connecting to gmail email accounts went fine, but setting up two IMAP accounts on a locally-hosted server resulted in the error message in the attached picture. This was after the config was greenlit/tested as OK. The workaround was to select 'Advanced settings', which announced that the account would be created even if the settings weren't correct and then closing that screen.
Captures d’écran jointes

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I am guessing this is bug 1722256 https://bugzilla.mozilla.org/show_bug.cgi?id=1722256