Email to Case Premium recognizes that the setting is enabled and will automatically BCC the defined compliance address. We recommend disabling the "Enable Additional BCC" setting in Email to Case Premium to avoid the error "Sending an e-mail with new comment failed: First exception on row 0; first error: BCC_NOT_ALLOWED_IF_BCC_COMPLIANCE_ENABLED, When BCC compliance is enabled, other BCC addresses are not allowed: [bccAd-
 dresses, [EMAILADDRESS]]."