My guess that userid ADMINISTRATOR is reserved by LISTSERV, just like
POSTMASTER.

At 10:39 12/14/2000 Thursday, Tom Meunier wrote:

 >The enclosed message, found in the LISTSERV mailbox and shown under the
 >spool
 >ID 0453 in the  system log, has been identified as  a possible delivery
 >error
 >notice for the following reason: mail origin seems to be a mailer.
 >
 >------------------------ Message in error (18 lines)
 >--------------------------
 >Return-Path: <[log in to unmask]>
 >Received: from 168.39.176.37 by LISTS.COURTS.STATE.TX.US (SMTPL release
 >1.0d) with TCP; Thu, 14 Dec 2000 08:53:17 -0600
 >Received: by mail.8thcoa.court.state.tx.us with Internet Mail Service
 >(5.5.2650.21)
 >        id <XX36WKCP>; Thu, 14 Dec 2000 07:56:42 -0700
 >Message-ID:
 ><[log in to unmask]>
 >From: Administrator <[log in to unmask]>