Canadians could see disruptions to mail service before the end of the month reports ctv news, as Canada Post and the Canadian Union of Postal Workers appear far apart on a new contract. CUPW has been holding strike mandate votes across the country over the past few weeks. When it ends on Sept. 26, CUPW will be legally able to strike if its members give it a mandate to do so. Canada Post will also be legally able to lock out the workers, although it has not made any public signals that it plans to do so. Canada Post presented the union with offers on Friday.