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Cron sends emails with the "From" header always set to "From: root@example.com (Cron Daemon)" for all users, even though the envelope address (seen in the "Delivered-To" header in received email) is the user's correct email address. Is it possible to create a header rewrite rule which fixes the "From" header for outgoing emails?

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Create a file in /etc/exim4/conf.d/rewrite, for example 10-cron-rewrite, with the contents:

root@ETC_MAILNAME   "${if match {$header_from:}{.*(Cron Daemon).*} {$sender_address}fail}"  f
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