A message was sent to an auto responder from a NULL address. A NULL address is one that should never receive a response from an AutoResponder so GMS will not send the automessage to this address.
In this particular case session Undefined was receiving an email from IP address Undefined. The email was apparently from Undefined to Undefined.
This is the correct action so no action is required by you.
Keywords:Autoresponder holiday junk mail NULL <> 8230