`emailrelay-list-verify.js <emailrelay-list-verify.js>`_
--------------------------------------------------------

.. code:: javascript

    //
    // SPDX-FileCopyrightText: 2026 Graeme Walker <graeme_walker@users.sourceforge.net>
    // SPDX-License-Identifier: FSFAP
    // 
    // Copyright (c) 2026 Graeme Walker <graeme_walker@users.sourceforge.net>
    // 
    // Copying and distribution of this file, with or without modification,
    // are permitted in any medium without royalty provided the copyright
    // notice and this notice are preserved.  This file is offered as-is,
    // without any warranty.
    // ===
    //
    // emailrelay-list-verify.js
    //
    // An example E-MailRelay address verifier script for
    // Windows that uses a hard-coded list of recipient
    // addresses.
    //
    try
    {
    	var to = WScript.Arguments(0) ;
    	//var from = WScript.Arguments(1) ;
    	//var ip = WScript.Arguments(2) ;
    	var domain = WScript.Arguments(3) ;
    	//var mechanism = WScript.Arguments(4) ;
    	//var id = WScript.Arguments(5) ;
    
    	// list of recognised recipient addresses
    	//
    	var users = [
    		["alice",""] , // valid
    		["bob",""] , // valid
    		["carol","carol.smith@"+domain] , // valid, with mapping
    		["dave","@david"] , // local mailbox, with mapping
    		["erol","@"] , // local mailbox
    		["malory","@@"] // abort
    	] ;
    
    	// split the recipient address and check the domain part
    	var re = new RegExp( "([^@]*)@(.*)" ) ;
    	var user_part = to.match(re)[1] ;
    	var domain_part = to.match(re)[2] ;
    	if( domain_part.toLowerCase() !== domain )
    	{
    		WScript.StdOut.WriteLine( "invalid address" ) ;
    		WScript.StdOut.WriteLine( "invalid domain-part ["+domain_part+"]" ) ;
    		WScript.Quit( 2 ) ;
    	}
    
    	// case-insensitive match of the user part
    	var user_key = "" ;
    	var user_value = "" ;
    	for( var i = 0 ; i < users.length ; i++ )
    	{
    		var user = users[i] ;
    		if( user_part.toLowerCase() === user[0].toLowerCase() )
    		{
    			user_key = user[0] ;
    			user_value = user[1] ;
    			break ;
    		}
    	}
    
    	if( user_value.charAt(0) === '@' && user_value !== "@@" )
    	{
    		// valid local recipient address with a mailbox
    		var mailbox = user_value === "@" ? user_key : user_value.substr(1) ;
    		WScript.StdOut.WriteLine( to ) ;
    		WScript.StdOut.WriteLine( mailbox ) ;
    		WScript.Quit( 0 ) ;
    	}
    	else if( user_key.length && user_value !== "@@" )
    	{
    		// valid recipient address
    		var address = user_value.length ? user_value : (user_part+"@"+domain) ;
    		WScript.StdOut.WriteLine( "" ) ;
    		WScript.StdOut.WriteLine( address ) ;
    		WScript.Quit( 1 ) ;
    	}
    	else if( user_value === "@@" )
    	{
    		// abort
    		WScript.Quit( 100 ) ;
    	}
    	else
    	{
    		WScript.StdOut.WriteLine( "invalid address" ) ;
    		WScript.StdOut.WriteLine( "invalid user-part ["+user_part+"]" ) ;
    		WScript.Quit( 2 ) ;
    	}
    }
    catch( e )
    {
    	WScript.StdOut.WriteLine( "error" ) ;
    	WScript.StdOut.WriteLine( e.name + ": " + e.message ) ;
    	WScript.Quit( 3 ) ; // temporary failure
    }
    

.. _../examples/emailrelay-list-verify.js: emailrelay-list-verify_js.html