Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
   ComObj;

 procedure TForm1.Button16Click(Sender: TObject);
 const
   olMailItem = 0;
   olByValue = 1;
 var
   OutlookApp, MailItem, MyAttachments: OLEVariant;
 begin
   try
     OutlookApp := GetActiveOleObject('Outlook.Application');
   except
     OutlookApp := CreateOleObject('Outlook.Application');
   end;
   try
     MailItem := OutlookApp.CreateItem(olMailItem);
     MailItem.Recipients.Add('YourMailAddress@something.com');
     MailItem.Subject := 'Your Subject';
     MailItem.Body    := 'Your Message';
     myAttachments    := MailItem.Attachments;
     myAttachments.Add('C:\SomeFile.txt', olByValue, 1, 'Name of Attachment');
     MailItem.Send;
   finally
     myAttachments := VarNull;
     OutlookApp    := VarNull;
   end;
 end;