NetCat Tutorial at securitdocs.com

SecurityDocs: Comment on NetCat Tutorial
Netcat is a simple Unix utility which reads and writes data across network connections, using TCP or UDP protocol. It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities. Netcat, or "nc" as the actual program is named, should have been supplied long ago as another one of those cryptic but standard Unix tools.

Netcat’s homepage is: http://netcat.sourceforge.net
The official Netcat homepage makes no reference to Windows systems, however you can find a Win32 copy at
http://www.vulnwatch.org/netcat/.

send emails using JScript + Netcat

Automated Email Sending From The Command Line Using JScript (CodeProject)
Send emails using JScript and Netcat. This technique can used for mailouts or load testing.
Download nc111nt.zip - 104.4 KB (NetCat for Windows)
Netcat for Windows is phenomenally powerful when driven from Windows Scripting Host!

Netcat On Windows Background
Netcat is a very powerful, open source (GPL 2) network tool that come originally from Unix. It is so powerful and easy to use that it has gained a bad reputation as a hacker tool. This is not what it was designed for, and indeed, many security professionals use it in the war against hackers.

var strExe = "nc -v smtp.myserver.co.uk 25";

var objShell = WScript.CreateObject("WScript.Shell");
var total  = 512;
var delay  = 0;
var victim = "oops@example.com";

for(var i=0;i<total;++i)
{
    var strExeIn ="HELO nerds-central.com\r\n"; 
        strExeIn+="MAIL FROM: <test@example.com>\r\n";
        strExeIn+="RCPT TO: <"+victim+">\r\n";
        strExeIn+="DATA\r\n";
        strExeIn+="Body of email: this is an auto generated test email.\r\n";
        strExeIn+="This is "+(i+1)+" of "+total+"\r\n";
        strExeIn+=".\r\n";
        strExeIn+="QUIT\r\n";

    var objScriptExec = objShell.Exec(strExe);
    objScriptExec.StdIn.write(strExeIn);
    objScriptExec.StdIn.close();
    WScript.echo("Sending "+(i+1)+" of "+total+" to "+victim);
    WScript.echo(objScriptExec.StdOut.ReadAll());
    WScript.sleep(delay);
}