[exim] How to remove all X-Spam* headers

Hi,

is it possible to remove all headers they match a pattern in a router? I
saw different headers beginning with X-Spam or X-List. I want to remove
them all. The only idea I have is to extract all these header names from
$message_headers. Is there an easier way?

headers_remove = ${sg{$message_headers}{:.*\n}{:}}

Kind regards, Jörg.
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