On Fri, 10 Jul 2009, SM wrote:

Multiple addresses rarely appear in the From: header.

...and because of that it might be a useful spam sign worth a point, even though it's completely valid syntax.

It's better to have a rule for the multiple addresses in the Sender: header if you are receiving a lot of spam with the above headers.

I'd say look for it in both, as well as in Reply-To:

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
 jhar...@impsec.org    FALaholic #11174     pgpk -a jhar...@impsec.org
 key: 0xB8732E79 -- 2D8C 34F4 6411 F507 136C  AF76 D822 E6E6 B873 2E79
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