Hey, does anybody have the same problem when sending email to sales@ ?

"Delivery to the following recipient failed permanently:

     sales@spondoolies-tech.com

Technical details of permanent failure:
Message rejected by Google Groups. Please visit http://mail.google.com/support/bin/answer.py?hl=en&answer=188131 to review our Bulk Email Senders Guidelines."

Edit: cc of the same email sent to a person at spond seems to go through fine, so problem seems to be at sales@ address