The International QSL Bureau system was established and is loosely managed by the IARU. QSL bureaus world wide handle Amateur and SWL QSLs. Some countries do not have bureaus at all, some have only outgoing bureaus while others only provide bureau services (incoming or outgoing) for their members (RSGB & DARC for examples).
RAC supports the Canadian Outgoing QSL Bureau and you must be a RAC member to use this service. The Canadian National Incoming QSL Bureau is also supported by RAC,  but you do not need to be a member of RAC to use incoming bureau services.
The Regional Incoming Bureaus (like this one) are staffed by local volunteers and somewhat coordinated by RAC. The bureau is not funded or supported by any regional radio clubs, so it must be operated on a self-funding basis.  Put simply, all the bureau operating costs must be fully funded by you, the user.
Your VA3/VE3 regional incoming bureau is managed by Mike Christmas ( VE3XMS / VA3FS ) with the help of dedicated volunteers in Ontario, you can follow me on TWITTER @va3fs for bureau updates.
Please keep in mind, the VA3/VE3 Incoming QSL Bureau is for incoming VA3/VE3 cards only. All non-Canadian outgoing cards go to the RAC Outgoing Bureau.
As noted above you must be a member of RAC to use the Outgoing Bureau. When you send your cards to the Outgoing Bureau you must include your RAC member number (the first number at the top left of the TCA mailing label) or the mailing label itself. The use of the outgoing bureau is free to you as a RAC member.

There are two addresses involved, depending on whether your outgoing cards are for Canadian or non-Canadian cards.  Cards for Canadian hams are sorted by prefix and sent to the National Incoming Bureau at their address:

RAC National Incoming Bureau
PO Box 51
Saint John
New Brunswick
E2L 3X1

Cards for non-Canadian calls have to be sorted by callsign prefix.  Cards for US calls must be sorted separately as a group.  All non-Canadian cards are mailed to:

RAC Outgoing QSL Bureau
PO Box 11156 Station H
Nepean, Ontario
K2H 7T9

If you include your email address and ask, they will notify you by email when they receive your cards.