App loads forever waiting localhost when I try sending an email with ASP.NET MVC

//This is email creation
               var body = "<p>Email From: {0} ({1})</p><p>Message: Morning. This is a test trying sending emails from ASP.Net MVC. Thanks to tell me if you receive the message. </p><p>{2}</p>";

               var message = new MailMessage();
               //message.To.Add(new MailAddress("eunicelakloe@yahoo.fr"));
               message.To.Add(new MailAddress("nice55kloe@mail.com"));
               message.From = new MailAddress(model.FromEmail);
               //message.From = new MailAddress("emapong@secelgroup.com");
               message.Subject = "This is a test trying sending emails with ASP.Net MVC";
               message.Body = string.Format(body, model.FromName, model.FromEmail, model.Message);
               message.IsBodyHtml = true;

               //This manages the created email sending
               using (var smtp = new SmtpClient())
               {
                   var credential = new NetworkCredential
                   {
                       UserName = "myemail@gmail.com",  // replace with valid value
                       Password = "password"  // replace with valid value
                   };
                   smtp.Credentials = credential;
                   smtp.Host = "smtp-mail.outlook.com";
                   smtp.Port = 465;
                   smtp.EnableSsl = true;

                   await smtp.SendMailAsync(message);
                   return RedirectToAction("Sent");
               }
           }
           return View(model);

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    <h4>Send your comments.</h4>
    <hr />
    <div class="form-group">
        @Html.LabelFor(m => m.FromName, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.TextBoxFor(m => m.FromName, new { @class = "form-control" })
            @Html.ValidationMessageFor(m => m.FromName)
        </div>
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.FromEmail, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.TextBoxFor(m => m.FromEmail, new { @class = "form-control" })
            @Html.ValidationMessageFor(m => m.FromEmail)
        </div>
    </div>
    <div class="form-group">
        @Html.LabelFor(m => m.Message, new { @class = "col-md-2 control-label" })
        <div class="col-md-10">
            @Html.TextAreaFor(m => m.Message, new { @class = "form-control" })
            @Html.ValidationMessageFor(m => m.Message)
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" class="btn btn-default" value="Send" />
        </div>
    </div>
}