GraphQL ENUM
enum MailTypeEnum {UNKNOWNORDER_CONFIRMATIONQUOTEREGISTRATION_INFORMATIONCANCELLATION_CONFIRMATIONOFFER_REJECTEDPAYMENT_DECLINEDREVIEWPURCHASE_ORDER_ON_REVIEWPAST_DUE_NOTERECEIPTINVOICEDELIVERYPHYSICAL_DELIVERY_UPDATEREFUNDPURCHASE_EMAIL_VERIFICATIONLOD_CONFIRMATION_REQUESTCHARGEBACK_INFORMATION_CUSTOMERRETRIEVAL_INFORMATION_CUSTOMERRETRIEVAL_INFORMATION_CUSTOMER_SUBSCRIPTIONREQUEST_FOR_PAYMENTSUBSCRIPTION_AUTO_CHARGE_REMINDERSUBSCRIPTION_ON_HOLDSUBSCRIPTION_ON_GRACESUBSCRIPTION_OFFLINE_PAYMENT_REMINDERSUBSCRIPTION_ONLINE_PAYMENT_EXPIREDSUBSCRIPTION_ONLINE_PAYMENT_CHANGED_NOTIFICATIONSUBSCRIPTION_CANCELEDSUBSCRIPTION_REINSTATEDSUBSCRIPTION_RETRY_PAYMENTSUBSCRIPTION_UPDATE_NOTIFICATION_CUSTOMERPASSWORD_RECOVERY_CUSTOMERCUSTOMER_PURCHASE_LOOKUPNEWSLETTER_CONFIRMATIONNEWSLETTER_SUBSCRIPTIONNEWSLETTER_UNSUBSCRIPTIONRECEIPT_AFTER_TAX_UPDATESUBSCRIPTION_RENEWAL_QUOTESTRONG_CUSTOMER_AUTHENTICATION_REQUIRED}