[exim] SPAM with empty subject field

[paul.mcilfatrick]

Lately we have been receiving a lot of SPAM with the empty subject
field.
 
I have searched the Exim 4 book and also the v4.6x spec pdf file looking
for a variable that holds an incoming message's subject as I want to do
a check in the acl_smtp_data ACL for this type of SPAM.
 
Is there such a variable?
 
 
My search of the pdf file found mention of the $h_subject variable.
 
Is this variable available in Exim?
 
 
Thanks
 
 
Paul McIlfatrick
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