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Server Configuration Issue

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Cannot send emails in Thunderbird application, instead getting error messages. After asking about creating a security exception, which we don't want, the following error message appears:

Sending of the message failed. Peer's Certificate issuer is not recognised. The configuration related to [server name] must be corrected.

No indication on how this can be corrected. Don't understand why it has suddenly become a error, when Thunderbird was previously working fine.

Please help!

Cannot send emails in Thunderbird application, instead getting error messages. After asking about creating a security exception, which we don't want, the following error message appears: Sending of the message failed. Peer's Certificate issuer is not recognised. The configuration related to [server name] must be corrected. No indication on how this can be corrected. Don't understand why it has suddenly become a error, when Thunderbird was previously working fine. Please help!

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