Hi Whizard
Your response with respect to FREE mail omitted some important features. I have reproduced below Section 38 of the Post Office Act 0f 1867 which was enacted April 1, 1868
FRANKING AND FREE MAIL MATTER.
Certain Letters and other mailable matter to be free of Postage
All letters and other mailable matter addressed to or sent by the Governor or sent to or by any department of the Government at the seat of Government, shall be free of Canada pottage under such regulations as may from time to time be made in that respect by the Governor in Council ;
Senate and House of Commons
Letters and other mailable matter addressed to or sent by the Speaker or Chief Clerk of the Senate or of the House of Commons, or to or by any Member of either House at the Seat of Government, during any Session of Parliament, or addressed to any of the members or Officers in this section mentioned, at the seat of Government as aforesaid, during the ten days next before the meeting of Parliament, shall be free of postage ;
The same
All public documents and printed papers may be sent by the Speaker or Chief Clerk of the Senate or of the House of Commons, to any Member of either House, during the recess of Parliament, free of postage ;
Limitation
The privilege of free transmission as above given in this section shall apply only to mail matter passing between the seat of Government and places in Canada.
Parliamentary papers
Members of either the Senate or House of Commons of: Canada may, during the recess of Parliament, send by Mail free of Postage, all papers printed by order of either House.
Post Office letters, etc
The Postmaster General may prescribe the conditions and circumstances under which letters, accounts and papers, relating solely to the business of the Post Office, and addressed to or sent by some officer thereof, shall be free from Canada Postage ;
Petition, &c., to Local Legislatures
Petitions and Addresses to either of the Provincial Legislatures of Ontario, Quebec, New Brunswick or Nova Scotia, or to any Branch thereof, and also Votes and Proceedings and other papers printed by order of any such Legislatures or any Branch thereof, during any Session thereof, may be sent free of postage under such regulations as the Postmaster General may prescribe.
The full text of the Act is available at
http://en.wikisource.org/wiki/Post_...ce_Act,_1867GJP