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Can't Add Second Email Account - Incoming Server Exists Error

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I'm trying to add a second email account from my domain into Thunderbird and on the password test page I get an error. Of course the server exists, my other email account also uses it. How do I fix this or is this a problem with Thunderbird?

I'm trying to add a second email account from my domain into Thunderbird and on the password test page I get an error. Of course the server exists, my other email account also uses it. How do I fix this or is this a problem with Thunderbird?
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The following link might be helpful: A strange problem on adding a new mailadress https://support.mozilla.org/en-US/questions/1545926#answer-1778073

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FYI: Version 145.0 Windows 11 Pro

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Chosen Solution

The following link might be helpful: A strange problem on adding a new mailadress https://support.mozilla.org/en-US/questions/1545926#answer-1778073

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