How can I enable gmail to recieve email from my project, Email notification Identity EF , VS13 Update 2

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C#3.5

string code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
                   var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
                   await UserManager.SendEmailAsync(user.Id, "Confirm your account", "Please confirm your account by clicking <a href=\"" + callbackUrl + "\"></a>");

                   return RedirectToAction("RegistrationSuccess", "Account");

these lines of code are the default ones which came with Update two MVC Controller I had Uncommented them and it works with Yahoo but not with Gmail