plausible? i thought the headers having

Received: from relay01.ibill.com (208.62.229.38)
SMTP; 17 Aug 2006 15:58:04 -0500
Received: from exch01.CORP.IBILL.COM (exch01.corp.ibill.com [10.148.100.203])
by relay01.ibill.com (8.12.11/8.12.11) with ESMTP id

made this more than plausible.