メールヘッダー＆フィッシング解析ツール

From: "Billing Team" <billing@example.com>
To: Alex <alex@example.net>
Reply-To: support@xn--paypa1-l2c.example
Return-Path: <bounce@mail.example.com>
Subject: =?UTF-8?B?UGF5bWVudCBub3RpY2U=?=
Date: Mon, 31 Aug 2026 10:02:08 +0800
Message-ID: <demo-8301@mail.example.com>
Received: from mx.example.net (mx.example.net [203.0.113.40]) by inbox.example.net with ESMTPS id 91AA for <alex@example.net>; Mon, 31 Aug 2026 10:02:08 +0800
Received: from mail.example.com (mail.example.com [198.51.100.24]) by mx.example.net with ESMTPS id 72BB; Mon, 31 Aug 2026 10:01:22 +0800
Authentication-Results: mx.example.net; spf=pass smtp.mailfrom=mail.example.com; dkim=pass header.d=example.com; dmarc=pass header.from=example.com
DKIM-Signature: v=1; a=rsa-sha256; d=example.com; s=selector1; h=from:to:subject; b=demo
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="demo-boundary"

--demo-boundary
Content-Type: text/html; charset=UTF-8

<p>Please review your invoice at <a href="http://203.0.113.90:8080/login">the billing portal</a>.</p>
--demo-boundary
Content-Type: application/octet-stream; name="invoice.pdf.exe"
Content-Disposition: attachment; filename="invoice.pdf.exe"
Content-Transfer-Encoding: base64

ZGVtbyBvbmx5
--demo-boundary--