This is why some people create their own CA and self-signed certificates, which is cheaper. Usually certificates are signed by so called Certificate Authorities and they most often take money for their service. If it is you have to start over and the person who stole it can decrypt everything, so keep it save and password protected. The private must never ever be lost and given to others. A certificate in that sense is nothing more than the public key but it has some more information than just a key, it tells who you are, your organisation, etc. In this form of encryption you need two keys, a private one and a public one. I am just writing this part for the people who are not familiar with asymmetric encryption: I can only answer the Mac Mail part of this question as I do not want to test the Thunderbird part.
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