當灰名單遇上bounce字串

[soontai]

請問一下, 如果開了灰名單機制, 卻碰上這樣的 mail , 紅色字串會隨著重寄時改變, 於是永遠歸類在灰名單裡, 該怎麼處理??不可以用白名單, 因為有可能是新客戶, 未知的客戶

我現在都不敢開灰名單機制, 會被業務跟老闆投訴並且被背後插幾十把有倒勾的刀

X-MD-FROM: bounce+ca9a2d.16f904-olivia.chou=soontai.com@pasternack.com
X-MD-TO: olivia.chou@soontai.com
Received: from mail-s53.mailgun.us ([184.173.153.53])
by mail.soontai.com ([192.168.0.252]);
Fri, 5 Jan 2018 07:20:54 +0800
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for <olivia>; Fri, 5 Jan 2018 07:20:41 +0800 (UTC)
DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=pasternack.com; q=dns/txt;
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X-Mailgun-Sid: WyJhOTNiMyIsICJvbGl2aWEuY2hvdUBzb29udGFpLmNvbSIsICIxNmY5MDQiXQ==
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Thu, 04 Jan 2018 23:20:43 -0000 (UTC)
MIME-Version: 1.0
From: "Pasternack Purchases" <PurchaseReply>
To: olivia.chou@soontai.com
Cc: LAnaya@infiniteelectronics.com
Date: 4 Jan 2018 15:20:42 -0800
Subject: Here is the Purchase Order #PO31275
Content-Type: multipart/mixed;
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[Arnor]

雙面刃呀...
這樣就了解在網站上設計業務詢問的表單的重要性,
統一化的inquiry表單有效率得多呀.
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素還尊
Team John Long.
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[soontai]