While certain other sites (ahem) may charge you a couple of hundred dollars for this information, it's not rocket science. And to throw in an unrelated anecdote, a friend used the following quote in an I-Banking interview: "I'm an engineer. I can literally build rockets. Whatever you throw at me, I can handle" (Yes, he did make it to the final round).
Now back to e-mail addresses. Remember - before you e-mail an individual, or if you're looking for the right person to e-mail, Google "Firm Name + Your University + Recruiting".
A simple "Bain McGill Recruiting" search takes you right to Bain's McGill-specific page for recruitment, letting you know that Courtney Evans is the right person to e-mail. And what do you know, her e-mail is listed right there on the page. The second google link that comes up? BCG at McGill. Yes, folks, it's that easy.
The following is the basic e-mail format for the major consulting firms: