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

[Marc Perkel]

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.

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