Ee have to look at each and every item in the Contacts folder and check to see if the item happens to be a distribution list. If it is, we can then bind to that item (the distribution list) and methodically collect all the members and send them a mail.

Code: VB
Const olFolderContacts = 10
  sDistName = "Friends" 'set the distribution list name here
  Set objOutlook = CreateObject("Outlook.Application")
  Set objNamespace = objOutlook.GetNamespace("MAPI")
  Set colContacts = objNamespace.GetDefaultFolder(olFolderContacts).Items
  intCount = colContacts.Count
  For i = 1 To intCount
      If TypeName(colContacts.Item(i)) = "DistListItem" Then
          Set objDistList = colContacts.Item(i)
          sEmails = "";
          If objDistList.DLName = sDistName Then
              For j = 1 To objDistList.MemberCount
                  sEmails = sEmails & ";" & objDistList.GetMember(j).Address
              'send the mail using the emails u got! ;-) enjoy
          End if
      End If