Hi Thorsten,
autosupport.mailhost smtpserver
autosupport.support.to autosupport@netapp.com
autosupport.support.transport smtp
autosupport.to "customer puts his email here"
As you can see from above, the customer can put his own email in as receiver and run a test. its also important that the transport method is SMTP.
My autosupport will nto show the DFM server, but it will show autosupports received by netapp. Also, if you trigger an autosupport like this:
options autosupport.doit "test"
You should in theory receive and email from NetApp stating they have received a TEST autosupport acknowledging it.
Cheers,
Eric