Problem in DKIM authentication

Problem in DKIM authentication

Hi, I'm trying to set DKIM signature on my domain, acomoo.com.

zoho._domainkey.acomoo.com
TXT
"v=DKIM1; k=rsa; p=xxxxxxxxxxxxxxxxxxxxxx"
('v=DKIM1; ' may not be necessary? )

I followed the instruction of  DomainKeys in control panel and checked if it works using test tool, http://www.appmaildev.com/en/dkim/.  But keep getting the following result.

============================== =
DomainKey result: pass
 ===============================
============================== =
 DKIM result: none (no signature)
 ===============================



Any idea?

Thanks!