I don't even understand how the following message works (let alone how
to block it).

It simply has a chunk of what looks like encoded binary; and yet,
thunderbird renders it as a stock announcement (as I write this, I
wonder whether the good readers of this list are likely to the ascii
block, or the rendered version?  view source for me please).  The
header: "Content-Transfer-Encoding: base64" should probably give me a clue.

How do we filter out spam like this?  This got 0 hits.

Thanks for your time.

[snip]
X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on ace1.vineyard.net
X-Spam-Level:
X-Spam-Status: No, hits=0.0 required=5.0 tests=EMPTY_MESSAGE=,
        FM_NO_FROM_OR_TO=,FM_NO_TO=,MISSING_SUBJECT=,NO_RECEIVED=,TO_CC_NONE=
        bayes=0.5 autolearn=failed version=3.1.0

[snip]

From: "Roxie F. Hankins" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: Focus Stock Alert
Date: Sat, 11 Mar 2006 23:33:30 +0000
MIME-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: base64
X-Virus-Scanned: by AMaViS-ace1 at Vineyard.NET

SW4gdGhlIGN1cnJlbnQgb2lsIG1hcmtldCwgc2VsZWN0IHNtYWxsIGVuZXJn
eSBkZWFscyBhcmUgZmx5aW5nLiAgDQpXaXRoIGdyb3dpbmcgZGVtYW5kLCBz
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ciBzZWN0b3IgdG8gaW52ZXN0IGluPyANCkhlcmUncyBvdXIgbmV4dCB3aW5u
ZXI6DQoNCkNvOiBQcmVtaXVtIFBldHJvfF9ldW0gSW5jLg0KU3ltOiBQIFAg
VCB8XyAgDQpDdXJyZW50bHkgVHJhZGluZyBhdDogJDAuMDIgICAgDQoxIFdl
ZWtfVGFyZ2V0X1ByaWNlOiAgJDAuMTANCg0KQSBNYXNzaXZlIFBSIENhbXBh
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cnkgYW5kIGRldmVsb3BtZW50IG9mIGEgDQpkaXZlcnNlIHBvcnRmb2xpbyBv
ZiBoaWdoIHZhbHVlLCBsb3cgcmlzayBlbmVyZ3kgcHJvamVjdHMuICANCiAg
ICAgICAgICAgICANCiAgICAgICAgICAqIEdPT0QgTFVDSyAmIFRSQURFIE9V
VCBUSEUgVE9QICo=


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