壊れたDateフィールドを持つspam

今日届いたUCEのヘッダ(の一部)¹．

Received: from ECKPSRC (unknown [221.2.80.78])
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    for <foo@example.jp>; Tue, 9 Dec 2008 13:41:51 +0900 (JST)
Message-ID: <13c2b01c959b8$7fe86140$0a00080a@lyonk>
From: <bar@example.com>
To: <foo@example.jp>
Subject: The education of your dream.
Date: Sat, 67 Dec 61520 21166:3260:21170 +0800
(snip)