This error you could fix if you have the root certificate from your provider. You will get this error if your provider is using self signed certificates because its cheaper. This error could also appear on your pc when you date and time is not set right.
If the certificate is no longer valid you cant solve the problem (in most cases) and you will need to contact you mail provider as well to fix the problem. Every certificate has a certain time its valid and it can between 1 year up to 5. You cant solve this problem and you will need to contact your provider and he needs fix this issue. The mail server name e.g doesent match the name on the certificate. Please post a screenshot showing the error and the certificate. There are three possible sources for the error you are getting.
To solve the problem first of all we need to know more about the error you are getting.
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