我的论坛最近被一系列类似的垃圾邮件轰炸。它们每次都使用不同的发件人、域名和 IP。（但它们总是关于某个建筑行业的会议。）
它们最终被归类到“拒绝”中，并带有 Email::Receiver::BadDestinationAddress 错误，系统会尝试向无效的发件人地址发送拒绝邮件。哎呀，日志太乱了。
事实上，它们根本没有 to: 或 cc: 地址。我了解到收件人实际上是在 SMTP 信封中定义的，而不是在邮件头中，并且邮件列表系统可能会故意省略 to:/cc: 字段。
我不太愿意深入研究 Postfix 配置，但显然它可以进行邮件头检查…
想知道是否有人已经尝试过并有什么建议？
FWIW 示例垃圾邮件头
Received: from 103-191-76-30.cprapid.com (unknown [103.191.76.30]) by forum-mail-receiver.localdomain (Postfix) with ESMTPS id 0845A2FB2B6; Thu, 08 Jan 2026 02:30:19 +0000
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Date: Wed, 07 Jan 2026 21:26:55 -0500
From: alexg@connectconsortiumplaceru.com
Message-ID: <093f4b04eb0e41f70390cf63dcce77d4@connectconsortiumplaceru.com>
Subject: 5th Annual Modular Construction & Prefabrication Symposium - Toronto,
Canada | March 2026 (Limited Seats Left)
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