Sending email in it's own Thread.

Thread tEmail = new Thread(new ThreadStart(() => client.Send(msg)));
                tEmail.IsBackground = true;
                tEmail.Start();

                                              

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Thread tEmail = new Thread(new ThreadStart(client.Send()));
                tEmail.IsBackground = true;
                tEmail.Start();

                                              

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
using System.Text;
using System.Threading;
 
namespace WindowsService1
{
  public partial class Service1 : ServiceBase
  {
    Thread MyThread;
    BatchProcessor Process;
    
 
    public Service1()
    {
      InitializeComponent();
    }
 
    protected override void OnStart(string[] args)
    {
      // TODO: Add code here to start your service.
      MyThread = new Thread(Process.Start);
      MyThread.Start();
    }
 
    protected override void OnStop()
    {
      // TODO: Add code here to perform any tear-down necessary to stop your service.
      Process.Abort();
      MyThread.Abort();
    }
  }
}
 
 
//---------------------MAIN PROCESSING CLASS--------------------------
 
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
 
namespace WindowsService1
{
  class BatchProcessor
  {
 
    System.Timers.Timer mTmr;
 
    public void BatchProcessor()
    {
      mTmr = new System.Timers.Timer();
      mTmr.Elapsed += new System.Timers.ElapsedEventHandler(mTmr_Elapsed);
    }
 
    void mTmr_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {
      MainProcess();
    }
 
    public void Start()
    {
      Console.WriteLine("Start");
      mTmr.Interval = 20;
      mTmr.Enabled = true;
      MainProcess();
    }
 
    public void Abort()
    {
      Console.WriteLine("Abort");
    }
 
    public void MainProcess()
    {
      Console.WriteLine("Main Process");
    }
 
  }
}
                                              

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