Imap, Pop3 or Smtp via HTTP or SOCKS proxy

// C# version

ProxyFactory factory = new ProxyFactory();
IProxyClient proxy = factory.CreateProxy(ProxyType.Http, "221.3.154.9", 80);

Socket socket = proxy.Connect("imap.example.org", Imap.DefaultPort);

using (Imap imap = new Imap())
{
    imap.Attach(socket);

    // regular imap code

    imap.Close();
}

' VB.NET version

Dim factory As New ProxyFactory()
Dim proxy As IProxyClient = factory.CreateProxy(ProxyType.Http, "221.3.154.9", 80)

Dim socket As Socket = proxy.Connect("imap.example.org", Imap.DefaultPort)

Using imap As New Imap()
   imap.Attach(socket)

   ' regular imap code

   imap.Close()
End Using

// C# version

ProxyFactory factory = new ProxyFactory();
IProxyClient proxy = factory.CreateProxy(
   ProxyType.Http, "221.3.154.9", 80);

Socket socket = proxy.Connect("imap.gmail.com", Imap.DefaultSSLPort);

using (Imap imap = new Imap())
{
    imap.AttachSSL(socket, "imap.gmail.com");

    // regular imap code

    imap.Close();
}

' VB.NET version

Dim factory As New ProxyFactory()
Dim proxy As IProxyClient = factory.CreateProxy( _
   ProxyType.Http, "221.3.154.9", 80)

Dim socket As Socket = proxy.Connect("imap.gmail.com", Imap.DefaultSSLPort)

Using imap As New Imap()
   imap.AttachSSL(socket, "imap.gmail.com")

   ' regular imap code

   imap.Close()
End Using

11 Responses to “Imap, Pop3 or Smtp via HTTP or SOCKS proxy”

1. phoenicyan Says:
   April 1st, 2011 at 01:30

   Thank you for the great product and the blog! However, when I tried to connect to imap.google.com via a proxy I got the exception:
   “Proxy responded with a 302 code – Found.”

   How this should be handled? Here is my code:

   ProxyFactory factory = new ProxyFactory();

   string host = “64.27.0.30″;
   IProxyClient proxy = factory.CreateProxy(ProxyType.Http, host, 80);

   Console.WriteLine(“Connecting…”);

   try
   {
   Socket socket = proxy.Connect(“imap.gmail.com”, Imap.DefaultPort);

   Console.WriteLine(“Connected!”);

   Imap imapClient = new Imap();
   imapClient.AttachSSL(socket, “imap.gmail.com”);

   Console.WriteLine(“Attached!”);

   imapClient.Close();
   }
   catch (Exception e)
   {
   Console.WriteLine(“{0}”, e.Message);
   }

   Thank you!

2. Limilabs support Says:
   April 1st, 2011 at 09:23

   @phoenicyan
   You need to connect to imap.gmail.com over SSL:

   Your code should look as follows (note Imap.DefaultSSLPort constant):

   string host = "62.27.0.30";
   IProxyClient proxy = factory.CreateProxy(ProxyType.Http, host, 80);
   
   Socket socket = proxy.Connect("imap.gmail.com", Imap.DefaultSSLPort);
   
   using(Imap imap = new Imap())
   {
       imap.AttachSSL(socket, "imap.gmail.com");
       imap.Close();
   }
   

3. phoenicyan Says:
   April 1st, 2011 at 19:12

   Thank you for the quick response. I have tried using DefaultSSLPort as well, but got the same exception – “302 code”. Does this code work on your computer? Is it possible that it is not working on our systems due to limitations of our corporate LAN?

   I have configured the proxy in FireFox and it looked like working…

4. Limilabs support Says:
   April 2nd, 2011 at 09:31

   @phoenicyan
   I can not connect to the proxy you are using.
   I’ve send you an email, so we can work on this issue together.

   The error you are getting is returned by the proxy, and it’s a redirect. It does not seem like a problem with Mail.dll.

   The code is definitely working – I’ve tried with many different proxy servers.

5. phoenicyan Says:
   April 4th, 2011 at 19:05

   I have tried with a different proxy and it worked! I think I just selected invalid proxies previous times.

6. VMedvedeva Says:
   April 5th, 2011 at 16:14

   Hello! I try to use your dll to connect “pop.gmail.com” and get an exception
   “An attempt of operation on socket with network disabled
   95.84.187.10:8080

   at System.Net.Sockets.Socket.Connect(IPAddress[] addresses, Int32 port)
   at System.Net.Sockets.Socket.Connect(String host, Int32 port)
   at Limilabs.Proxy.HttpProxy.HttpProxyClient.Connect(String destinationHost, Int32 destinationPort)
   at Pop.Program.Main(String[] args) в C:Pop3MailClientPop3MailClientPop3MailClientProgram.cs:строка 27″.

   Could you tell me what I do wrong?

7. Limilabs support Says:
   April 5th, 2011 at 17:06

   @VMedvedeva

   Is the network enabled?
   Have you disabled your anti-virus software?

8. jgw Says:
   October 4th, 2011 at 00:48

   I have a problem; I’m trying to use a socks5 proxy, which I know is working, but it parses the error that I require authentication (username, password) for the socks5. I know it doesn’t require authentication. Any help would be appreciated.

9. Limilabs support Says:
   October 4th, 2011 at 17:34

   @jgw

   If the error says you need to authenticate why do you claim it doesn’t require authentication?
   Please contact us directly as I don’t think we can help you via blog

10. Matvey Says:
    October 6th, 2011 at 14:38

    I’ve downloaded your mail package in zip and installer, but cant find Proxy.dll library in this package.

11. Limilabs support Says:
    October 6th, 2011 at 16:29

    @Matvey

    You can find it in:
    Mail.zip/Redistributables/Proxy/Proxy.dll

    or when you installed Mail.dll in:
    C:/Program Files/Limilabs/Mail/Redistributables/Proxy/Proxy.dll

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