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Expression Filter issue

Hi all

Under "Email Protection" --> "SMTP" --> "Antispam" --> Expression Filter" I added a Filter ".*@[0-9]+\.com".

The attached mail was not filtered, but it has the Expression "From: "long_trox" <long_trox@126.com>" in it.

What's the reason, it was not filtered?

Header:

From: "long_trox" <long_trox@126.com>
Sender: "atwakdniku" <atwakdniku@parliament.gov.za>
To: "Recipient"
Subject: [EXTERNAL]  Re: Radio frequency connectors and cable assembly manufacturer
Date: Mon, 15 May 2023 19:05:23 +0200
Message-ID: <1262570000.114578.1684170323886@mycronic-com.se1.mx-wecloud.net>
MIME-Version: 1.0
Content-Type: multipart/related;



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