[exim] Setting ACL variable to a random string

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Autor: Florian Weimer
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A: exim-users
Assumpte: [exim] Setting ACL variable to a random string
I've just discovered that $message_exim_id is not set when RCPT TO:s
are checked. However, I need some kind of unique ID at this stage.
It needs not be related to the future value of $message_exim_id, it's
sufficient if it's (very likely) unique.

Is there a better way to achieve this than using something like
${readfile{/proc/sys/kernel/random/uuid}{\n}}?

-- 
Florian Weimer                <fweimer@???>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99