Configuring sendmail not to reveal internal hostnames

[Mike]

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>From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
>
>As the subject says, this is OT. I apologize.
>
>I'm searching for a means by which I can tell sendmail to expose the
>host names of local computers on our network. The computers are named
>after the users they are associated with so that reveals a lot to folks
>in the outside world. Anyone know of a means to disable this? I just
>want to disable the reverse lookup.

I'm doing something similar. I do not want e-mails destined for the outside world to contain any information of the internal infrastructure. What I do is simple, I remove the "Received:" header from all e-mails coming from the LAN on the e-mail gateway(s). You can use the "Remove These Headers" option to point to a file (make sure it ends with ".rules") which contains something like this:

From:     10.     Received: X-Mozilla-Status: X-Mozilla-Status2:
FromOrTo: default X-Mozilla-Status: X-Mozilla-Status2:

This way all internal routing information is removed for outgoing e-mails. 

>Thanks!
>
>Errol Neal

Mike.

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