Just went with MXLogic. His address was not with the original group. Added him later. He gets email sent to a distribution list here that he is a member of, but any email addressed specificially addressed to him gets this message
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 553 553 mailbox ________is restricted (Mode: normal) (state 17).