The walkout by Canadian Union of Postal Workers (CUPW) at the York Distribution Centre will affect parcel delivery from downtown Toronto north up to Newmarket and east to Port Hope.
Canada Post says the strikes have caused a backlog in their delivery network, and customers can see delays in delivery of up to several days.
Gagne said the main issue comes to the health and safety of workers. Around 170 federal employees are affected in these communities.
"We don't want to shut down the postal service completely but we do want to make an impact on the employer - they're not being very forthcoming at the bargaining table", said Jarema.
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In recent years, said Hamilton, the corporation's parcel deliveries have seen double-digit yearly increases.
Mail will not be delivered in Edmonton Monday after hundreds of local postal workers walked off the job as part of a series of ongoing 24-hour rotating strikes across the country. Postal workers suffer from disability injuries five times more than the average federal sector worker, he said. Canada Post says it has made "significant offers to CUPW that include increased wages, job security, and improved benefits", and claims it has not asked for any concessions in return.
Meanwhile, walkouts in Newfoundland and Labrador began at one minute after midnight in the communities of Carbonear, Exploits Valley, Gander-Lewisporte, Deer Lake, St. Anthony and Stephenville.
Last week, Labour Minister Patty Hajdu appointed Morton Mitchnick, a former chairman of the Ontario Labour Relations Board, to help the two parties resolve their differences.