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Help with popup saying certificate is not valid for that server.

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A couple months ago, I asked internet provider to discontinue service. I continued to get emails from their server anyway. In fact, I think I am continuing to get some from them but appears they maybe forwarded to my gmail address instead of iowatelecom.net address that I was using. Now, when Thunderbird downloads my emails, first thing that pops up is a message saying "The certificate for imap.iowatelecom.net is not valid for that server. Someone could be trying to impersonate the server and you should not continue." Then, it gives me the little box with "Dismiss", that I can check. It will go ahead and download my emails into the gmail folder. The iowatelecom.net folder is in RED and no emails are going to that folder. Can I or should I get rid of the iowatelecom.net folder and if so, how should I proceed. Just don't want to mess everything up. Thanks for the help.

A couple months ago, I asked internet provider to discontinue service. I continued to get emails from their server anyway. In fact, I think I am continuing to get some from them but appears they maybe forwarded to my gmail address instead of iowatelecom.net address that I was using. Now, when Thunderbird downloads my emails, first thing that pops up is a message saying "The certificate for imap.iowatelecom.net is not valid for that server. Someone could be trying to impersonate the server and you should not continue." Then, it gives me the little box with "Dismiss", that I can check. It will go ahead and download my emails into the gmail folder. The iowatelecom.net folder is in RED and no emails are going to that folder. Can I or should I get rid of the iowatelecom.net folder and if so, how should I proceed. Just don't want to mess everything up. Thanks for the help.

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Turn off email scanning in your antivirus.. Does the message go away?

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Hmm, not sure. Are you referring to Microsoft account? I see under Privacy and Security there is a "Let apps access email" and that is in the ON position. I also noted that my microsoft account still has my old email and I need to get that changed, somehow. It wants to send me a code to my old email address and that one at iowatelecom.net isn't working.

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