Rules Not Executing Correctly

[geggold]

I have a situation in which some of the rules do not appear to be working. For example, this message SHOULD be caught by at least TWO rules (one for "undeliverablemail" and one for "unknown host"), but it's not. Why?

Date: Wed, 28 Apr 2010 14:47:01 -0500
Message-Id: <11004281447.AA37141@mail.wauknet.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
From: "Postmaster" <postmaster@mail.wauknet.com>
Sender: <postmaster@mail.wauknet.com>
To: <no-reply@ottoenvironmental.com>
Subject: Undeliverable Mail
X-Mailer: <SMTP32 v10.02>
X-RCPT-TO: <no-reply@ottoenvironmental.com>
Status: `
X-UIDL: 567489223
X-IMail-ThreadID: 90b5000008cc6d57

Unknown host: thuan@i-dna-sg


Original message follows.