nnir imap search does not work as expected

[Arkady Grudzinsky]

Hi, everyone,

I'm using Gnus to access my Gmail account via nnimap.

When I search a group using 'GG' and type query

,----
| FROM "author@domain.com"
`----

The search produces emails containing "author@domain.com" and not
necessarily in the "From:" header.

Same happens with search

,----
| SUBJECT "keyword"
`----

I get a list of emails with "keyword" anywhere in the message.

Same happens with query

,----
| +from:example@example.com
`----

which is supposed to produce "messages with example@example.com
in the From: header" as mentioned in

http://sachachua.com/blog/2008/05/emacs-gnus-searching-mail/

Is this expected behavior?  What am I missing?

-- 
Arkady