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Date: Thu, 29 Sep 1998 23:34:45 +0900
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550 neko.example.org (smtp)... 550 Host unknown
554 <kijitora@neko.example.org>... 550 Host unknown (Authoritative answer from name server)

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From: shironeko@example.jp
To: kijitora@neko.example.org
Subject: Nyaaan

Nyaaan