public new async Task SendMailAsync(MailMessage message)
{
if (_disposed)
{
throw new ObjectDisposedException("SmtpClientEx");
}
if (message.To.Count == 0)
{
throw new ArgumentException("Message does not contain receipent email address.");
}
if (DeliveryMethod == SmtpDeliveryMethod.Network)
{
string host = _host;
if (string.IsNullOrEmpty(host))
{
//resolve MX for the receipent domain using IDnsClient
if (_dnsClient == null)
{
_dnsClient = new DnsClient()
{
Proxy = _proxy
}
}
;
IReadOnlyList <string> mxDomains = await Dns.DnsClient.ResolveMXAsync(_dnsClient, message.To[0].Host);
if (mxDomains.Count > 0)
{
host = mxDomains[0];
}
else
{
host = message.To[0].Host;
}
_port = 25;
Credentials = null;
}
if (_proxy == null)
{
if (_smtpOverTls)
{
EndPoint remoteEP = EndPointExtension.GetEndPoint(host, _port);
if ((_tunnelProxy != null) && !_tunnelProxy.RemoteEndPoint.Equals(remoteEP))
{
_tunnelProxy.Dispose();
_tunnelProxy = null;
}
if ((_tunnelProxy == null) || _tunnelProxy.IsBroken)
{
_tunnelProxy = await TunnelProxy.CreateTunnelProxyAsync(remoteEP, true, _ignoreCertificateErrors);
}
base.Host = _tunnelProxy.TunnelEndPoint.Address.ToString();
base.Port = _tunnelProxy.TunnelEndPoint.Port;
}
else
{
base.Host = host;
base.Port = _port;
}
await base.SendMailAsync(message);
}
else
{
EndPoint remoteEP = EndPointExtension.GetEndPoint(host, _port);
if ((_tunnelProxy != null) && !_tunnelProxy.RemoteEndPoint.Equals(remoteEP))
{
_tunnelProxy.Dispose();
_tunnelProxy = null;
}
if ((_tunnelProxy == null) || _tunnelProxy.IsBroken)
{
_tunnelProxy = await _proxy.CreateTunnelProxyAsync(remoteEP, _smtpOverTls, _ignoreCertificateErrors);
}
base.Host = _tunnelProxy.TunnelEndPoint.Address.ToString();
base.Port = _tunnelProxy.TunnelEndPoint.Port;
await base.SendMailAsync(message);
}
}
else
{
await base.SendMailAsync(message);
}
}
