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  1. Sep 2 09:53:55 mailfront001 postfix/smtpd[23714]: NOQUEUE: reject: RCPT from unknown[10.10.11.3]: 450 4.1.8 <root@server1.lan.domain.com>: Sender address rejected: Domain not found; from=<root@server1.lan.domain.com> to=<xts@domain.com> proto=ESMTP helo=<mail.lan.domain.com>
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