How to check for unsent email

Как проверить неотправленную почту

var
  Outbox: MAPIFolder;
  UnsentMail: integer;
begin
  Outbox := NmSpace.GetDefaultFolder(olFolderOutbox);
  UnsentMail := Outbox.Items.Count;
  if (UnsentMail > 0) then
    ShowMessage(Format('Unsent items in Outbox: %d', [UnsentMail]));
end;

The constant olFolderOutbox is defined in Outlook_TLB as $00000004

Language: en
ID: 04455