To write an MP, write on the envelope:
The MPs name, House of Commons, Ottawa, Ontario, CanadaK1A 0A6. No stamp is needed.
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To e-mail, the formula is: firstname.surname@parl.gc.ca
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To write to Justin Trudeau, Chystia Freeland (Minister of International Trade), Tom Muclair (willing to work at preventing ratification) and Elizabeth May (keenly aware of the environmental ramifications of TPP), copy this text block:
justin.trudeau@parl.gc.ca, Chrystia.Freeland@international.gc.ca, or chrystia.freeland@parl.gc.ca + Thomas.mulcair@parl.gc.ca, elizabeth.may@parl.gc.ca
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To find your MP, click here, enter your postal code, and your MP will be found for you
Cabinet MPs are listed here
All members of parliament and their phone numbers and fax are listed here
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To contact a Member of Parliament, please contact the Information Service at: info@parl.gc.ca

Toll-free (Canada): 1 (866) 599-4999
Telephone: 1 (613) 992-4793
TTY: 1 (613) 995-2266