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From header format....

2008-06-24 09:53:48
Hello!

I suppose I could dig through RFC's, but I'm feeling lazy, and I'm sure
someone knows this right off the top of their head.

Lately I've seen some spam with *multiple* addresses on the visible
"From:" header of spam. Is this ever 'valid'? Or can I safely filter out
mail which lists more than one address on the "From:" header?

- Charles

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