DKIM dkim=permerror when use campaigns

DKIM dkim=permerror when use campaigns

Hello support

I have some problems with DKIM on Zoho Campaigns (SPF work fine!)

For example, our hosting mail is GAPPS and our DNS server support support TXT/SPF/DKIM

We not have problem directly with mail, for example to a YAHOO account:

Received-SPF: pass (domain of kad!OURDOMAIN!sistemas.com designates 209.85.212.196 as permitted sender)
X-Originating-IP: [209.85.212.196]
Authentication-Results: mta1041.mail.bf1.yahoo.com  from=kad!OURDOMAIN!sistemas.com; domainkeys=neutral (no sig);  from=kad!OURDOMAIN!sistemas.com; dkim=pass (ok)
Received: from 127.0.0.1  (EHLO mail-wi0-f196.google.com) (209.85.212.196)
  by mta1041.mail.bf1.yahoo.com with SMTP; Mon, 19 Aug 2013 18:40:03 -0700


But when send trough Zoho Campaigns

Received-SPF: pass (domain of zcsend.net designates 72.5.230.120 as permitted sender)
X-Originating-IP: [72.5.230.120]
Authentication-Results: mta1245.mail.ne1.yahoo.com  from=kad!OURDOMAIN!sistemas.com; domainkeys=permerror (no key);  from=kad!OURDOMAIN!sistemas.com; dkim=permerror (no key)
Received: from 127.0.0.1  (EHLO sender.zcsend.net) (72.5.230.120)
  by mta1245.mail.ne1.yahoo.com with SMTP; Tue, 20 Aug 2013 01:45:02 +0000

We followed all the steps indicated in Email-Auth. to use DKIM with Zoho.

Thanks