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What do I do about this warning I am receiving when I refresh my inbox? "The certificate for pop.windstream.net is not valid. Someonecould be trying to impersonate the server and you should not continue"

Capt S McDonald

What do I do about this warning I am receiving when I refresh my inbox? "The certificate for pop.windstream.net is not valid. Someone could be trying to impersonate the server and you should not continue"

   Unable to receive new messages on my Thunderbird inbox for this warning
What do I do about this warning I am receiving when I refresh my inbox? "The certificate for pop.windstream.net is not valid. Someone could be trying to impersonate the server and you should not continue" Unable to receive new messages on my Thunderbird inbox for this warning

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This is a duplicate of post

https://support.mozilla.org/en-US/questions/1612389

Please respond there.