Debian – DKIM- Filter No Signature Data

I have installed DKIM-Filter on Postfix after reading this tutorial

http://www.unibia.com/unibianet/systems-networking/how-setup-domainkeys-identified-mail-dkim-postfix-and-ubuntu-server

My email now has a DKIM signature but still it is landing in the SPAM folder. Here is the header

    Received-SPF: neutral (google.com: 69.164.193.167 is neither permitted nor denied by best guess record for domain of promote@a2labs.in) client-ip=69.164.193.167;
Authentication-Results: mx.google.com; spf=neutral (google.com: 69.164.193.167 is neither permitted nor denied by best guess record for domain of promote@a2labs.in) smtp.mail=promote@a2labs.in; dkim=hardfail (test mode) header.i=@a2labs.in
Received: from promote.a2labs.in (localhost [127.0.0.1])
    by promote.a2labs.in (Postfix) with ESMTPA id 34858530E8
    for <vineet@ivineet.com>; Mon, 28 Feb 2011 12:23:07 +0530 (IST)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=a2labs.in; s=mail;
    t=1298875987; bh=bo+H1VYPIHMja2u7i1lnzr4k/j4Pe8iSf79bVw94XpI=;
    h=To:Subject:Message-ID:Date:From:Reply-To:MIME-Version:
     Content-Type:Content-Transfer-Encoding; b=nhTdlnUwo0iUJ92ycQzKSRjw
    5Pfya0DJcJrAc8Mr2hIv8OLpgzBCzdOMWTGqR5nuUmAzgCGYBhYAM2XZwVxo9JG/iz7
    oYKysmNQnskFx0TRyW3UOkDWcfHcPnCL6Y7fGzZWinmsyjsg47k+mKZg/e8jqlwTAMO
    PYKkt5pBz7SM0=

Also my mail.err file shows

Feb 28 12:17:03 ivineet dkim-filter[32181]: 1F788530E1: no signature data
Feb 28 12:18:02 ivineet dkim-filter[32181]: 432BA530E2: no signature data

How to fix it