notmuch don't search some message

[Marcelo Laia]

I receive message from a friend with

Friends Name <friendsname at hotmail.com>

If I hit F8 and search for "Friends", all messages received before May,
27 are showed in the list.

But, if I search for "friendsname", all message from today are showed!

This is a bug? Or a missconfiguration?

I use Debian, Mutt, Offlineimap, msmtp and notmuch-mutt.

-- 
Laia, ML