web problem...check proxy validation

Question

Hi all,
I have a problem , how can I know if the proxy is working or not from c# app?
there is a lot of difficults met me
if you want to see if there a response from the requested site..this will be failed
because the ISP's can make response to the request (alternative page contain block reasons)  so c# will give you that response state is ok. and if you will compare the request site with the urlresponse it will be fail because when you request http://www.google.com it will be using proxy be http://www.google.co.uk if it is UK's proxy and so on
so how can i derermin if the proxy works or not????
please help me and the answer must be studied carfully before posted here....

thanx alot..

Answer 1

In this case you have to implement security logic, the .Net provides an entire API  System.Security, you can create a permission set that determines rule of messages transactions 

Answer 2

I mean every outgoing mail of a company (mail from a internal network to outside the network)

Answer 3

What do you mean by outgoing mail, do you mean from example a spam?

Answer 4

Thank you very much for your answer!

Probably I should explain a little bit more about the functionality I would like to implement. Basicaly I would like to check every outgoing mail. Therefore I would like to
1. stop the smtp queue
2. wait for messages
3.check these messages (allowed or unallowed and probably remove some of them)
4. Start the smtp queue, so the messages can be send

Answer 5

If I well understand your question you're using a Message queue object then you can do

MessageQueue mqueue = new MessageQueue();
            //This method will make the message queue in a standby state for any message
            IAsyncResult Async = mqueue.BeginReceive();

            //TO do perform you code here

            //This method
            Message Recived = mqueue.EndReceive(Async);
           
            //close the message queue
            mqueue.Close();
It's better to do that asynchormously