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   id E7AFE8943B; Fri, 20 Feb 2015 02:42:20 -0800 (PST) 
To: user@gmail.com 
Subject: test 
Message-Id: <20150220104220.E7AFE8943B@localhost.localdomain> 
Date: Fri, 20 Feb 2015 02:42:20 -0800 (PST) 
From: root@localhost.localdomain (root) 

/root

/^Received: by .*(wi.*)/ REPLACE Received: by 10.0.0.10 ${1}

postmap -q 'Received: by 10.36.69.68 with SMTP id y65csp999344ita;        Fri, 20 Feb 2015 02:42:22 -0800 (PST)' pcre:/etc/postfix/header_checks 
REPLACE Received: by 10.0.0.10 with SMTP id y65csp999344ita;        Fri, 20 Feb 2015 02:42:22 -0800 (PST)

/^Received: by mydomain\.localdomain (.*)$/  REPLACE Received: by local_mail_server ${1}