espocrm/application/Espo/Modules/Crm/Resources/metadata/aclDefs/MassEmail.json

{
    "ownershipCheckerClassName": "Espo\\Modules\\Crm\\Classes\\Acl\\MassEmail\\OwnershipChecker",
    "linkCheckerClassNameMap": {
        "inboundEmail": "Espo\\Modules\\Crm\\Classes\\Acl\\MassEmail\\LinkCheckers\\InboundEmailLinkChecker"
    },
    "accessCheckerClassName": "Espo\\Modules\\Crm\\Classes\\Acl\\MassEmail\\AccessChecker"
}