[exim] how to check a message header for being empty

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Autor: lee
Data:  
Para: exim-users
Asunto: [exim] how to check a message header for being empty
Hi,

I'm trying to do something like this:


  warn message = Invalid message headers
    condition = ${if eq {$h_Subject:}{" "}}



And it doesn't work in that messages with an empty Subject: header are
not detected.

What's the condition I need to use to detect an empty header?


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