[exim] Starting extern command in rcpt acl

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Lähettäjä: Nathan Huesken
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Vastaanottaja: Exim Mailinglist
Aihe: [exim] Starting extern command in rcpt acl
Hello,

in my rcpt acl, I would like to start an extern command (abook) to check if the sender address is in my addressbook and should be whitelistet.
How do I do that?

Thanks!
nathan