I have tried to setup up DKIM several times but cannot get a positive result from the DKIM reflector test.

The DNS entry is successfully verified, but the reflector test email comes back with this:

Authentication System:       DomainKeys Identified Mail
   Result:                   DKIM signature confirmed BAD
   Description:              Signature verification failed, message may have been tampered with or corrupted
   Reporting host:           sendmail.net       
   More information:         http://mipassoc.org/dkim/
   Sendmail milter:          https://sourceforge.net/projects/dkim-milter/


I've tried using a different domain name for DKIM and have waited several days for the DNS to propagate but still no luck.

Has anyone any ideas? Ken?