internal ip address

Denis Beauchemin Denis.Beauchemin at
Wed Feb 6 13:30:30 GMT 2008

alexbo at a écrit :
> Hi there,
> my Linux server has MailScanner v4.65.3 with postfix v2.1.5
> When, for example, I send a message from a pc whose internal ip address is taking a look in the headers of outgoing mail I've seen the last header just before Message-ID to appear like that
> Received: from [] (pc1 [])
> by (Postfix) with ESMTP id 6EBF7A75C7
>     for <aaa at>; Tue,  5 Feb 2008 14:16:09 +0100 (CET)
> Why the ip address of the sender is shown (twice) in square brackets ?
> My task is avoiding the outer world to know the internal ip of the sender... 


The IP addresses you use are non-routable.  That means nobody can access 
your computers from the internet because no router will allow them.  So 
don't worry about the whole world knowing about your internal IP addresses.


  °v°   Denis Beauchemin, analyste
 /(_)\  Université de Sherbrooke, S.T.I.
  ^ ^   T: 819.821.8000x62252 F: 819.821.8045

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