How to limit header display?

[David Abrahams <dave@boostpro.com>]

Is there any way to limit the headers WL displays by default?
When reading messages I often see something like this, which is way
more than I need:

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TIA,
--
Dave Abrahams           Meet me at BoostCon: http://www.boostcon.com
BoostPro Computing
http://www.boostpro.com