Are you sure that the "Bulk Mail" folder gets selected? Do you see other valid mails from the Bulk Mail folder when you are not using ->search?

Your usage of ->select is not the recommended way. The documentation recommends using

$imap->select('Bulk Mail') or die "Could not select: $@\n";

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In reply to Re^5: perl imap spam text search is not working what i need to do by Corion
in thread perl imap spam text search is not working what i need to do by vasanthgk91

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