You need to select the mailbox (folder) against which you wish to perform the search first using the select method - If you do not know the hierarchy, separators and namespace of your IMAP mail store, the folders and namespace methods may be useful.

For example:

my @folders = $imap->folders;
foreach my $folder (@folders) {

    $imap->select($folder) or 
            die('Cannot select IMAP folder - ', $@);
    if ($imap->search(@search)) {

        push @results, $imap->Results;
    }
}
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