SPF_SOFTFAIL but there's no SPF record

[Rosenbaum, Larry M.]

SpamAssassin version 3.1.4
  running on Perl version 5.8.7    (and 5.8.5)

Any idea why a message with the following headers:

X-Envelope-From: <[EMAIL PROTECTED]>
Received: from mail.ans.org (mail.ans.org [206.222.45.53])
 by emroute1.ornl.gov (PMDF V6.2-1x9 #31038)
 with ESMTP id <[EMAIL PROTECTED]> for
[EMAIL PROTECTED]
 (ORCPT [EMAIL PROTECTED]); Wed, 30 Aug 2006 11:51:52 -0400 (EDT)
Received: from GWDOMAIN-MTA by mail.ans.org     with Novell_GroupWise;
Wed,
 30 Aug 2006 10:49:21 -0500

would get the following hits:

        *  1.4 SPF_SOFTFAIL SPF: sender does not match SPF record
(softfail)
        *      [SPF failed: ]
        *  2.4 SPF_HELO_SOFTFAIL SPF: HELO does not match SPF record
(softfail)
        *      [SPF failed: ]

I see no SPF records for ans.org or mail.ans.org.
A message sent 14 minutes earlier with the same IP address, HELO address
and return address did not hit these SPF rules.

(note: usernames munged with xxxxxx and yyyyyy)

Thanks,
Larry