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Upgraded to new Thunderbird - Now get "requested domain name does not match the server’s certificate."

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Not all mail accounts on my domain are able to send mail. One account sends and receives just fine; another account receives but cannot send. Same settings. Same domain. I deleted the failing account and set it back up again. It still cannot send mail. I have several domains on the same server and I am now seeing the same behavior for various accounts. The messages reads: "Sending of the message failed. Unable to communicate securely with peer: requested domain name does not match the server’s certificate. The configuration related to webmail.kittysave.org must be corrected."

That is odd because I can send mail from the other accounts on that domain that also use web.kittysave.org.

I have explored every single one of the accounts across the domains and I see that all the settings are the same. Must I reinstall the old version of Thunderbird to get my send capabilities restored?

Not all mail accounts on my domain are able to send mail. One account sends and receives just fine; another account receives but cannot send. Same settings. Same domain. I deleted the failing account and set it back up again. It still cannot send mail. I have several domains on the same server and I am now seeing the same behavior for various accounts. The messages reads: "Sending of the message failed. Unable to communicate securely with peer: requested domain name does not match the server’s certificate. The configuration related to webmail.kittysave.org must be corrected." That is odd because I can send mail from the other accounts on that domain that also use web.kittysave.org. I have explored every single one of the accounts across the domains and I see that all the settings are the same. Must I reinstall the old version of Thunderbird to get my send capabilities restored?