On Tue, Aug 25, 2015 at 11:30:07AM +0200, Christian Kivalo wrote:
Maybe this applies to your problem, from
http://www.postfix.org/header_checks.5.html

      Message headers added by the cleanup(8) daemon itself are
excluded from inspection.  Examples  of  such  message  headers  are From:,
To:, Message-ID:, Date:.

Thank you, Christian!

   But how to influence the way Cleanup is creating the From: header
for a particular user? Not to use the e-mail address
        username@hostname.domainname
but a specific one? And not to use the user full name from gecos field from 
/etc/passwd.

Regards,
Hans

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