I received a signed email (signed by IdenTrust) Thunderbird said the signature is not valid. It says that I do not trust the CERT authority. Help please.

I sent an email signed by my work at home (which uses Thunderbird). I can read the email ok but get the following certificate error message:

This message contains a digital signature, but the signature is not valid. The certificate used to sign the message was issued by a CA that you do not trust to issue this type of certificate.

The issuing authority is: IdenTrust ECA 3

How can I alleviate this problem? I need send emails encrypted back, but without this work, it is impossible.

Thanks in advance.

You must have the root CA cert in the store of certificates of Thunderbird on the References tab.
The error message indicates that the cert is, but you need to change the trust.

Tags: Thunderbird

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