OTTAWA—  The Postal Workers Union is now refusing to deliver direct marketing mail, including flyers, catalogues and community newspapers. Canada Post says it needs operational flexibility such as part-time staffing and dynamic delivery routes to stay competitive with private carriers like UPS and FedEx. Due to ongoing labor disruptions and service uncertainty, many Canadian businesses have already transitioned to digital marketing and alternative delivery services. After nearly two years of contract wrangling, the gulf between Canada Post and the Canadian Union of Postal Workers (CUPW) remains wide. And now, CUPW has upped the ante. In the case of a strike Direct mail printers take the biggest hit.