[exim] Logging Spam Report In Rejectlog for Investigation

[Brian Spraker via Exim-users]

Using Spamassassin with Exim.
When an email is accepted and goes by the spam checking, the $spam_report 
variable is added to the X-Spam_report header.
However, if the spam is flat-out denied, information is logged in the 
rejectlog.  However, I'd like to be able to inspect these better.
Is there something that can be added to the ACL to also write the $spam_report 
to the rejectlog so I can see what rules were triggered in spamassassin to get 
to the score?
Thank you!
Brian S.
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