Exim 4.69 (or 4.71) ACL for SpamAssassin

I was having trouble with Exim not adding headers to SpamAssassin-checked emails. One day, when I should have really been doing something else, I read Chapter 40 of Exim’s specification, and all became clear.

Here’s what my appropriate ACL (in /etc/mail/exim.conf) looks now, almost completely by-the-book:

acl_check_data:
  
  # ...
  # malware section
  # ...
  
  # Add headers to a message if it is judged to be spam. Before enabling this,
  # you must install SpamAssassin. You may also need to set the spamd_address  
  # option above.
  
  # spams are never big and spamassassin can die on big emails, so we  
  # limit its use under 100kb  
  accept  condition = ${if >={$message_size}{100k}{yes}{no}}

  # put headers in all messages (no matter if spam or not)
  warn  spam = spamd:true
        add_header = X-Spam-Score: $spam_score ($spam_bar)
        add_header = X-Spam-Report: $spam_report
  
  # add second subject line with *SPAM* marker when message
  # is over threshold
  warn  spam = spamd
        add_header = Subject: *SPAM* $h_Subject:

  # reject spam at high scores (> 20)
  deny  message = This message scored $spam_score spam points.
        spam = spamd:true
        condition = ${if >{$spam_score_int}{200}{1}{0}}

  # Accept the message.
  accept

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