Sending document as attachment in email

Scenario:
You client want to be able to actually e-mail the document itself from the document library to themselves, so they could read it apart from being on the SharePoint site.

Solution:
Design a Custom Application Page and use the code below to email the document.

Code:

using System.Net.Mail

private void SendEmail(string toAddress, string subject, SPFile file, SPList list)
{
   SPWebApplication webApp = SPContext.Current.Site.WebApplication;
   SPOutboundMailServiceInstance mailServer = webApp.OutboundMailServiceInstance;
   string smtpServer = mailServer.Server.Address;

   string listUrl = SPContext.Current.Web.Url + list.DefaultViewUrl;

   MailMessage message = new MailMessage("administrator@training.com", toAddress);
   message.Subject = subject;
   message.IsBodyHtml = true;
   message.Body = "This file was sent from the following SharePoint list: " +
   "<a href=\"" + listUrl + "\">" + listUrl + "</a>.";

   Stream stream = file.OpenBinaryStream();
   //You can add code to figure out which MIME type to use based on the type of attachment.
   Attachment attachment = new Attachment(stream, @"application/msword");
   attachment.Name = file.Name;
   message.Attachments.Add(attachment);

   try
   {
       SmtpClient client = new SmtpClient(smtpServer);
       //client.Send(message);
       client.SendAsync(message,"mail sent.");

   }
   catch (Exception e)
   {
       throw e;
   }
   finally
   {
       stream.Close();
   }
}

Article:http://furuknap.blogspot.com/2008/07/send-sharepoint-document-library-file.html