[Exim] How do I display string match in my error message.

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I want to deny recipients (BCC:, CC:, TO:) that are in a file

deny      message      = Address is blacklisted here.
          recipients   = /etc/mail/blacklist-email-address
          log_message  = This email address ($variable) is locally
blacklisted

How can I display the string found in the above line.

/etc/mail/blacklist-email-address
bb@???
aaa@???

Gareth Segree
mailto:Gareth.Segree@gleanerjm.com <mailto:Gareth.Segree@gleanerjm.com>
Technical Support Analyst
The Gleaner Company Ltd.
7 North Street
Kingston
Tel: 922-3400

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