Answer
GMS Anti-Spam carried out a succesful DNSBL check on the remote system. GMS Anti-Spam has been set up so that email messages from servers listed in the particular DNSBL list should be acccepted.
In this case, session Undefined checked the server at Undefined. The DNSBL server at Undefined responded with Undefined.
There is no problem with GMS, so no action is required by you.
See Also:
Keywords:DNSBL accepted 8343