DKIM error

[sspitfire]

Im using several subdomains and each one has an account. I need to be able to send mail from those accounts that have correct dkim. Ive enabled spf and dkim in whm. I've used this command to generate the key "openssl genrsa -out /etc/dkim.key 1024 && openssl rsa -in /etc/dkim.key -out /etc/dkim.pub -pubout"

Do I need to copy public key in every account's DNS zone individually? This is a yahoo header:

Authentication-Results: mta1481.mail.ne1.yahoo.com from=xxx.info; domainkeys=permerror (no key); from=xxxx.info; dkim=permerror (no key)
Received: from 127.0.0.1 (EHLO mta3.xxxx.info) (198.50.175.96)
by mta1481.mail.ne1.yahoo.com with SMTP; Sun, 05 May 2013 13:36:28 +0000
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=dkim; d=xxx.info;
h=To:Subject:Message-ID:Date:From:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; [email protected];
bh=yEl7mSo5p7tcymd3e7Jg9hv0LgQ=;
b=GXtHkIOqv1SEOo2rHPIzc0Rs2sRzxSqYo6OzBbdiYfn/ZZ64TmacvpY/WcoBEXW7chHDxvTcdti+
tTbwAF5un5cp4zmlxd/bYnPOucnSQ4jtuCpffdyPpWcvwq7uiB3p/O2s5of9tBiOL/wzpNGmWh6u
5Qn7WKjaHB/tEbAAKqE=
DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=dkim; d=xxxr.info;
b=SuchMMEEPK706B47ZTE+dtXyfsBmugty+tfIlGKGuX4T5E5TW1EsybdiPuPBuo+gouJPXZqkKpm5
2MpbmU0UqrRE+cytN4fM58UUsssNqGmDhMzVV3+iLe3LX8igzpH55sNz9uZAvipaNqEGdjAYGYfm
+qTUefS7q+Njx/Ecbbc=;

Also Ive set my mta (PowerMTA) to sign mails with dkim.

How do I enable the dkim properly ?