There was no account with this name on GMS so the email message has been failed to a specific account on GMS. When a message is failed to an account, the Internet Standard failure message is created containing the errant original message. You will need to check this account to see what the content of the message is.
In this case, session Undefined was processing email from Undefined apparently from Undefined to Undefined. GMS has delivered the email to Undefined.
This is the correct result, no action is required by you. However, if this is not the correct action, you should check the option you have set for the Unknown User Action in GMS.
Keywords:unknownuseraction failed 8257