> > > > 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. > > > > The To: line in my case looks like: > > > > To: undisclosed-recipients:; > > RFC822 group syntax! Fascinating. You're right that notmuch doesn't > index group names, though I think it could with a small addition to > _index_address_group. It already descends into group addresses, it > just currently ignores the group name. > > > And I'm not able to find it in any way. Maybe notmuch won't parse it as an > > email and so won't store the To header to the database? > > I suspect it is indexing it. The only thing notmuch requires is that > the message be at least slightly well-formed and have either a From, > Subject, or To header. You can find the message's Message-ID header > and try a search like > > notmuch search id:<message-id> > > > Any idea if there is a way to dump what notmuch knows about given email? > > There's no easy way. You can use Xapian's quest and delve tools to > find the document ID and get the term list of a message, but this is a > *very* low-level view of what notmuch knows. Thank you for looking at this. At the moment I plugged procmail to my setup to tag any such messages (sent to undisclosed recipients) with appropriate tag. Thank you -- Vlad