warning: bounce_append: ignoring dsn code ""

Hi, i just enabled postgrey on debian by adding the
following to my  
main.cf:

smtpd_recipient_restrictions =
        permit_mynetworks,
        reject_unauth_destination,
        check_policy_service inet:127.0.0.1:60000

I didn't configure postgrey or anything, just reloaded
postfix.  
However, with it enabled, mail doesn't seem to get through
to my  
recipients, and I get a lof of these in my logs:

Dec 13 18:37:37 mail postfix/virtual[9499]: warning:
bounce_append:  
ignoring dsn code ""

What can this be related to?

Thanks,
Jonathan

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