Description:
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The text-directory has macros which are replaced by list-specific text, for
instance $listunsubaddr$ will be replaced by the List-unsubscribe-address.
Adding support for this to control/customheaders would be nice, because it
would elimintate the need to hardcode the
List-{Unsubscribe,Post,Subscribe,Help,Owner,Archive} required by RFC 2369[1].
[1] http://www.faqs.org/rfcs/rfc2369.html