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First of all, ultimate trust shouldn't be used for other's keys, full trust is enough. If you issued ultimate trust to make the key itself valid, you missunderstood the web of trust concept. If you just wanted all his certifications to be valid for you (thus, extending your web of trust), full trust is enough, if you at the same time certified him. ...


You cannot revoke the old key. Only the owner (whoever holds the private key) can do that. You probably don't want to remove the key from your keyring altogether because you still want to be able to verify signatures on old emails that were signed by your correspondent using the old key. Changing the trust level also seems to me like the wrong solution ...

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