I get mails not recognized as spam and I would like to extend spamassassin to reject these mails. The mails look very normal, but the message-id is conspicuous. I want to reject the mail if it contains .local at the end of message-id.

Subject: Tracking data
From: "Paula Booker" <booker...@static.vnpt.vn>
MIME-Version: 1.0
Content-Type: multipart/related;
Message-Id: <20160920154140.f5a976c...@static.vnpt.vn.local>
Date: Tue, 20 Sep 2016 15:41:40 +0700

My system is debian, amavis, spamassassin, clamav. How can I extend Spamassassin? Or can I just call /usr/bin/sa-update --no-gpg regularly and wait to get better ruleset?

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