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tesco mail configuration - security certificate problems

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I have configured Tesco.net messages to be picked up in Mozilla Thunderbird, but whether or not I am using the program I keep getting a box to tell me to 'add security exception', because Tesco is attempting to identify itself with invalid information. The security information is, in fact, correct, but although I click the 'confirm security exception' button, the program won't accept it. Sometimes, I have to click the button 10 or 15 times before the box disappears, only to reappear several times during the course of the day.

How can I stop this?

I have configured Tesco.net messages to be picked up in Mozilla Thunderbird, but whether or not I am using the program I keep getting a box to tell me to 'add security exception', because Tesco is attempting to identify itself with invalid information. The security information is, in fact, correct, but although I click the 'confirm security exception' button, the program won't accept it. Sometimes, I have to click the button 10 or 15 times before the box disappears, only to reappear several times during the course of the day. How can I stop this?

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What reason does Thunderbird give for rejecting the cert in the first place?

More information in this article.

https://support.mozilla.org/en-US/kb/add-security-exception

There have been reports before about a bad Tesco cert, so I guess they still haven't managed to fix it.