A post in the Law.com blog summarizes a theory put forth by Ned Snow, assistant professor at the University of Arkansas School of Law, who found a 250-year-old common law tradition granting copyright protection to authors of personal correspondence and now claims that forwarding an e-mail is a violation of copyright law… Here is the paper: A Copyright Conundrum: Protecting Email Privacy.
I am of the opinion that, if no means are taken to protect the copyrights, it is not an infringement to forward the email. In fact, unless the sender uses IRM (Information Rights Management), that is readily and freely available, I think he waives any such rights.
What about canadian common law?
Do not hesitate to forward this piece!