Windows 10 已于2025年10月14日停止支持。如果您正在使用 Windows 10,参见 这篇文章。

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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No access to email after upgrade.

john.davies228

I now get the message "Certificate for the mailbox is not valid for that server. Someone could be trying to impersonate the server and you should not continue". My provider tells me that the certificate is used for a number of emails. Any suggestions please?

I now get the message "Certificate for the mailbox is not valid for that server. Someone could be trying to impersonate the server and you should not continue". My provider tells me that the certificate is used for a number of emails. Any suggestions please?

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Thunderbird only shows the message once and it is not there long enough for a screen shot, regrettably. I have forgotten to mention that I am running Ubuntu.

I now get the message "Certificate for the mailbox is not valid for that server.

Can you provide the more specific error code shown in the error pop-up?

Are you running any kind of anti-virus software?