Usermanager.SendEmail不发送任何vbnet

Question

Public Async Function Register(model As RegisterViewModel) As Task(Of ActionResult)
        If ModelState.IsValid Then
            Dim user = New ApplicationUser() With {
                .UserName = model.Email,
                .Email = model.Email
            }
            Dim result = Await UserManager.CreateAsync(user, model.Password)
            If result.Succeeded Then
                Await SignInManager.SignInAsync(user, isPersistent:=False, rememberBrowser:=False)

                ' For more information on how to enable account confirmation and password reset please visit http://go.microsoft.com/fwlink/?LinkID=320771
                ' Send an email with this link
                Dim code = Await UserManager.GenerateEmailConfirmationTokenAsync(user.Id)
                Dim callbackUrl = Url.Action("ConfirmEmail", "Account", New With {.userId = user.Id, .code = code}, protocol:=Request.Url.Scheme)
                UserManager.SendEmail(user.Id, "Confirm your account", "Please confirm your account by clicking <a href=""" & callbackUrl & """>here</a>")

                Return RedirectToAction("Index", "Home")
            End If
            AddErrors(result)
        End If

        ' If we got this far, something failed, redisplay form
        Return View(model)
    End Function

这是标准注册码

现在我已经在web.config中设置了我的SMTP，我甚至测试了其他服务/电子邮件程序的详细信息并且它有效

  <system.net>
    <mailSettings>
      <smtp from="*@ziggo.nl" deliveryMethod="Network">
        <network defaultCredentials="true" host="smtp.ziggo.nl" port="587" userName="*@ziggo.nl" password="*" enableSsl="true" />
      </smtp>
    </mailSettings>
  </system.net>

现在这是我使用的smtp设置。我隐藏了我的个人详细信息*但我想知道为什么邮件没有通过UserManager发送.SendEmail