C# 邮箱不可用

我用下面的代码发送电子邮件时出现了以下错误，如果有人错了，请纠正我好吗

public async static Task SendEmailAsync(string email, string subject, string message)
{
    try
    {
        var _email = "myemail@hotmail.com";
        var epass = ConfigurationManager.AppSettings["mypassword"];
        var _dispName = "Blog";
        MailMessage myMessage = new MailMessage();
        myMessage.To.Add(email);
        myMessage.From = new MailAddress(_email, _dispName);
        myMessage.Subject = subject;
        myMessage.Body = message;
        myMessage.IsBodyHtml = true;
        using (SmtpClient smtp = new SmtpClient())
        {
            smtp.EnableSsl = true;
            smtp.Host = "smtp.live.com";
            smtp.Port = 587;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new NetworkCredential(_email, epass);
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.SendCompleted += (s, e) => { smtp.Dispose(); };
            await smtp.SendMailAsync(myMessage);
        }
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

服务器响应为：

 5.7.3 Requested action aborted; user not authenticated

---

尝试更改特定于hotmail的端口

hotmail SMTP端口：25或465

当我尝试25或465时，出现错误，提示“服务器不支持安全连接”。请将此更改为false

SMTP.EnableSsl=true:D