[exim] Write headers B4 spamassassin scan

Hi,

At the beginning the data acl, some headers are committed to writing but
are not actually written until after the data acl and thus are not
passed to Spamassassin. But I would like Spamassassin to read these
headers. Is there any way to write those headers before passing the
message to Spamassassin?

Thanks.
Craig