> to be pretty recent. Or are they saying that both ham and spam collected
> should be from the same time period. If so, do you know what the maximum
> time discrepancy could be? Should I worry about it at all?

Spam needs to be recent.  Ham should be recent if convenient.  But ham
usually doesn't change as much as spam, so older stuff will usually work.

Consider < 3 months (better: < 1 month) for spam, < 6 months for ham.

        Loren

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