[ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use RelayFromEmlFileAsync instead.")]
public IAsyncResult BeginRelayFromEmlFile(
	string filename,
	string senderEmail,
	EmailAddressCollection recipients,
	AsyncCallback callback,
	Object state
)

<ObsoleteAttribute("This method is obsolete in .NET 4.5+. Use RelayFromEmlFileAsync instead.")>
Public Function BeginRelayFromEmlFile ( 
	filename As String,
	senderEmail As String,
	recipients As EmailAddressCollection,
	callback As AsyncCallback,
	state As Object
) As IAsyncResult

using System;
using MailBee;
using MailBee.SmtpMail;
using MailBee.Mime;

class Sample
{
    // The actual code.
    static void Main(string[] args)
    {
        Smtp mailer = new Smtp();

        // Get the list of DNS servers from OS settings or the config file.
        mailer.DnsServers.Autodetect();

        // Initiate an asynchronous relay.
        mailer.BeginRelayFromEmlFile(@"C:\Temp\message.eml", "kathy@company.com",
            new EmailAddressCollection("mike@domain1.com, bob@domain2.com"), null, null);

        // Simulate some lengthy work here. At the same time, 
        // the message is being sent to recipients domains on another thread.
        System.Threading.Thread.Sleep(3000);

        // End the relay request. If send mail operation is still in progress, 
        // the method will wait until it's finished.
        mailer.EndRelayFromEmlFile();

        // Print the outcome.
        Console.WriteLine("Successfully sent to: " + mailer.GetAcceptedRecipients().ToString());
        Console.WriteLine("Not sent to: " + mailer.GetRefusedRecipients().ToString());
    }
}

Imports System
Imports MailBee
Imports MailBee.SmtpMail
Imports MailBee.Mime

Class Sample
    ' The actual code.
    Shared Sub Main(ByVal args As String())
        Dim mailer As New Smtp

        ' Get the list of DNS servers from OS settings or the config file.
        mailer.DnsServers.Autodetect()

        ' Initiate an asynchronous relay.
        mailer.BeginRelayFromEmlFile("C:\Temp\message.eml", "kathy@company.com", _
            New EmailAddressCollection("mike@domain1.com, bob@domain2.com"), Nothing, Nothing)

        ' Simulate some lengthy work here. At the same time, 
        ' the message is being sent to recipients domains on another thread.
        System.Threading.Thread.Sleep(3000)

        ' End the relay request. If send mail operation is still in progress, 
        ' the method will wait until it's finished.
        mailer.EndRelayFromEmlFile()

        ' Print the outcome.
        Console.WriteLine("Successfully sent to: " & mailer.GetAcceptedRecipients().ToString())
        Console.WriteLine("Not sent to: " & mailer.GetRefusedRecipients().ToString())
    End Sub
End Class