It's actually a very interesting proposition. As you know, electors do have to produce a document form of an address even if that is only a letter of attestation, for example, for seniors living in long-term care facilities. It may not require a photocopy, but in some cases it will pose a bit of a barrier.
There is no legal impediment that I'm aware of—certainly not in our legislation—to having Canada Post employees validate the identity and address of a person in-person, viewing their documents and then certifying that in a process that we could establish with Canada Post. In fact, there have been some discussions with Canada Post to that effect.
I cannot speak for Canada Post and to what extent they would be prepared to go there or what time they would require to do that. It's something that's being looked at, but I certainly cannot commit or say anything on behalf of Canada Post.
What I can say, however, is that the same kind of interaction is possible at the office of the returning officer, or there are sometimes in large districts additional offices for assistant returning officers. Though not as many certainly as postal outlets, there are places where people can go to and, in person, obtain a special ballot.