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

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Rohkem teavet
Teema arhiveeriti. Please ask a new question if you need help.
Archived

No access to email after upgrade.

Thunderbird Email and messaging
christ1 replied 1 aasta tagasi
john.davies228
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?

All Replies (3)

christ1
christ1
  • Top 25 kaastöötaja
  • Moderaator

Please post a screenshot of the error. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

john.davies228
john.davies228 Küsimuse esitaja

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.

christ1
christ1
  • Top 25 kaastöötaja
  • Moderaator
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?