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I understand you have an issue with Thunderbird.
Which kind of shield do you see on Thunderbird? It might be that your email server has changed the SSL certificate and you need to confirm it.
Can you please upload two screenshots for:
1) you SMTP / pop server configuration
2) the thunderbird shield that you get
Instruction on how to upload a picture on this site can be found on: http://ww2.justanswer.com/help/how-do-i-send-photo-or-file-expert-0
Please also confirm which domain / email server are you using.
Hello, I see the previous expert has left the conversation.
My name is***** will try my best to help you with your question.
Please reply and let me know if you still need assistance with this.