Why is this getting tagged as spam?

[jurness]

This is from an internal sender which is coming from a mail relay inside of my domain. The relay is one of my trusted networks which I have configured as: 10.22.130.87/32,10.22.10.12/32,10.22.0.0/16,127.0.0.0/8,192.168.222.0/24,192.168.130.0/24

I don't want to whitelist my domain or the user as so much of our spam is spoofed using our own addresses (like everyone else!).

What is going on here?

X-DSPAM-Result: Innocent
X-DSPAM-Class: Whitelisted
X-DSPAM-Confidence: 0.99
X-DSPAM-Probability: 0.0000
X-DSPAM-Signature: N/A
X-Virus-Scanned: amavisd-new at zimbra.tomsawyer.com
X-Spam-Flag: YES
X-Spam-Score: 4.111
X-Spam-Level: ****
X-Spam-Status: Yes, score=4.111 tagged_above=-10 required=4 tests=[AWL=0.464,
BAYES_50=0.001, FH_DATE_PAST_20XX=3.188, HTML_MESSAGE=0.001,
MIME_HTML_ONLY=1.457, DSPAM:Innocent=-1.000] autolearn=no

[xeon]

[SOLVED] FH_DATE_PAST_20XX - Spamassassin bug - incorrect tagging from Jan 1, 2010 on