Hi,The support has set up the following in our delivery templates:Precedence: bulkList-Unsubscribe: <%= provider.errorAddress !='' ? provider.errorAddress:delivery.mailParameters.errorAddress %>?subject=unsubscribe<%=escape(message.mimeMessageId) %>>TenantHeader: <%@ include option='DmRendering_cuid' %>Affinity: <%= delivery.scheduling.IPAffinity %>X-cust_MessageID: <%= message.id %>X-cust_DeliveryID: <%= delivery.id %>X-cust_InstanceName: xxx_mkt_prod1X-cust_IMSOrgID: <%@ include option='IMS_Or...