delayed mail?

I saw over 7 hours delay between postgresql.org and sever1.pgsql.org.
Does anynone know what's happening here?

Received: from postgresql.org (webmail.postgresql.org [216.126.85.28])
by server1.pgsql.org (8.11.6/8.11.6) with ESMTP id f9GBurU27235
for <t-ishii(at)sra(dot)co(dot)jp>; Tue, 16 Oct 2001 06:57:11 -0500 (CDT)
(envelope-from pgsql-hackers-owner+M14299=sra(dot)co(dot)jp=t+2Dishii(at)postgresql(dot)org)
Received: from sraigw.sra.co.jp (sraigw.sra.co.jp [202.32.10.2])
by postgresql.org (8.11.3/8.11.4) with ESMTP id f9G4GcP30712
for <pgsql-hackers(at)postgresql(dot)org>; Tue, 16 Oct 2001 00:16:39 -0400 (EDT)
(envelope-from t-ishii(at)sra(dot)co(dot)jp)
--
Tatsuo Ishii