Back on April 20th, 2010, John Gregory at slaw.ca asked whether there was Any Case Law on E-Signatures in Canada?
Here’s what looks to be the answer from the Court of Appeal for Ontario in Pintar Manufacturing Corp. v. Consolidated Wholesale Group Inc., 2011 ONCA 805 :
 When the appellant sent the email at 5:31 p.m., all of the elements necessary to create a binding guarantee were present. The amount of the debt was clear, the debt had crystallized, the appellant knew the terms of the contract giving rise to the debt, and the appellant provided an email signature. The consideration for the guarantee was forbearance in collecting the debt.