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The mail system
<<user-name>@wuwer.org>: permission denied
Reporting-MTA: dns; scol1.st.interia.pl
X-Postfix-Sender: rfc822; firstname.lastname@example.org
Arrival-Date: Tue, 22 Dec 2009 01:59:33 +0100 (CET)
Final-Recipient: rfc822; <user-name>@wuwer.org
Original-Recipient: rfc822; <user-name>@wuwer.org
Diagnostic-Code: x-unix; permission denied