[exim] Brain Teaser - how would you do this?

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Author: Marc Perkel
Date:  
To: exim-users
Subject: [exim] Brain Teaser - how would you do this?
OK - here's what I want to do. I want to forward a copy of selected
email to another email address, but only if the email address that I
want to forward to is a valid working email address. So - I need to do a
callout and check if the email address is valid before I forward a copy.

How would I do that? Thanks in advance.