Hello @wthalliii, Thank you for taking the time to update us👌 ⚠ Did you try deleting the Thunderbird account → steps 1 to 6, we provided 2 days ago? ⚠ Please log a request with Kaspersky Technical Support, select Application malfunction, Incompatibility with 3rd party software template. Provide a detailed history, including all steps you’ve taken & screen print(s), Support may request logs, traces & other data, they’ll guide you: After submitting the case, you’ll receive an automated email with an INC+12digits reference number, then, normally, within 5 business days, a Kaspersky Technical Support human will communicate with you, also by email, you may continue to engage with the Kaspersky Technical Team via email or by updating the INC in your MyKaspersky account. Thank you🙏 Flood🐳 +🐋 I apologize for taking so long to respond. There’s just too much going on in my life right now to have much time to spend trying to troubleshoot. No, I didn’t follow the instructions for deleting the email account in Thunderbird. I didn’t understand what it would accomplish to delete the email account that it’s having trouble with. Sure, that would solve the problem because it no longer will try to contact that email server. Or at least, that was my reasoning. If this is wrong, please explain what I’m missing. Also, my experience with Thunderbird is that sometimes it’s difficult to add accounts, so I wanted to avoid the potential trouble of having to add it back. That’s why I just followed the instructions for transferring the KIS certificate to Thunderbird. Please don’t take this as a criticism. I am a retired embedded systems engineer, so I am perhaps being over analytical. But I don’t know anything about Kaspersky software, so that’s why I need your help. And, again, thanks for your help and for your patience with me.