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From: Exim-users <exim-users-bounces+kyle=engr.uky.edu@???> on behalf of Odhiambo Washington via Exim-users <exim-users@???>
Sent: Wednesday, March 28, 2018 3:31 PM
To: exim users
Subject: [exim] Testing for the null sender in a system filter
How do I test for the null sender - <> - in a system filter?