Hi Vladimir, On Thu, Jul 11, 2013 at 9:24 AM, Vladimir Marek <Vladimir.Marek@oracle.com> wrote: > Since my mail works in a way that it hides everything but what I > selected to be shown to me, I was overlooking all mails which where sent > to undisclosed-recipients. I tried to match such mails by > to:undisclosed-recipients but that does not seem to work. Is there any > workaround to find such mails? I have some mail with this To header: To: Undisclosed recipients <Undisclosed recipients:;> I can find them with the search to:"Undisclosed recipients". Note the quotes. -- Adam