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Trust a certificate on Mac
If the Mail app on your Mac can’t verify a server or a signature, you can review the certificate that it displays.
In the Verify Certificate dialogue, click Show Certificate.
Review the certificate, then if you have confidence in the server or signature, select the tickbox to always trust the certificate or to acknowledge the signature is valid.
To read about current trust policies, click the arrow next to Details. See Change Certificate trust policies.
Click Connect or OK, then enter your account password (if required).
If the certificate is a root certificate, enter the name and password of an administrator of the Mac you’re using.
If you want to change a certificate’s trust policy later, use Keychain Access.