public bool IsMailOriginatingIPAddressInRbl(
	MailMessage msg,
	int receivedIndex,
	string rblHost
)

Public Function IsMailOriginatingIPAddressInRbl ( 
	msg As MailMessage,
	receivedIndex As Integer,
	rblHost As String
) As Boolean

using System;
using MailBee;
using MailBee.Mime;
using MailBee.DnsMX;
using MailBee.AntiSpam;

class Sample
{
    static void Main(string[] args)
    {
        RblFilter rbl = new RblFilter();

        // Logging is helpful for debugging.
        rbl.Log.Enabled = true;
        rbl.Log.Filename = @"C:\Temp\log.txt";
        rbl.Log.Clear();

        // RBL check needs DNS servers.
        rbl.DnsServers.Autodetect();

        // Grab some mail message to check. In production, you can get it from IMAP server or elsewhere.
        MailMessage msg = new MailMessage();
        msg.LoadMessage(@"C:\Temp\msg.eml");

        Console.WriteLine("Is in RBL: " + rbl.IsMailOriginatingIPAddressInRbl(msg, 0, "zen.spamhaus.org").ToString());
    }
}

Imports MailBee
Imports MailBee.Mime
Imports MailBee.DnsMX
Imports MailBee.AntiSpam

Class Sample
    Shared Sub Main(ByVal args As String())
        Dim rbl As New RblFilter()

        ' Logging is helpful for debugging.
        rbl.Log.Enabled = True
        rbl.Log.Filename = "C:\Temp\log.txt"
        rbl.Log.Clear()

        ' RBL check needs DNS servers.
        rbl.DnsServers.Autodetect()

        ' Grab some mail message to check. In production, you can get it from IMAP server or elsewhere.
        Dim msg As New MailMessage()
        msg.LoadMessage("C:\Temp\msg.eml")

        Console.WriteLine("Is in RBL: " & rbl.IsMailOriginatingIPAddressInRbl(msg, 0, "zen.spamhaus.org").ToString())
    End Sub
End Class