[exim] ${run ...} string expansion and input

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Autore: Marten Lehmann
Data:  
To: exim-users
Oggetto: [exim] ${run ...} string expansion and input
Hello,

${run} is a usefull string expansion, but how can I send something (e.g.
a message body) to STDIN of the command? If I can't send something to
STDIN, does a temporary file with the current message content exist
which I can use as command argument?

Regards
Marten