If your email account is hacked and someone else gets a certificate in your name, you'd be unable to *know* about it, because they would use a different CA.
Maybe I am confused but I thought you are using DNSSEC to sign the zones so only the domain owner could issue certificates for a zone (or corresponding email address). If you have "example.com" the domain owner of the domain would sign zone "joe.example.com" which can correspond to the "j...@example.com" email address. Under this scenario you would only have one CA per domain.
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