The name of a direct mailing service in Canada is Arrow Canadian
Mailing. It is a US-based company which process direct mailing from
the US to Canada. Canada Post is also dealing with direct mailing
service throughout Canada.
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Public Service Commission
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Bulk mailing services are often offered directly through the
national mail service such as The Royal Mail or the U.S. Postal
Service. There are third party companies such as Fedex that also
offer this type of service.