North American Network Operators Group

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Re: RFC 1918 addresses

  • From: Matthew James Gering
  • Date: Sun Jun 01 01:09:21 1997

> Exposing an RFC 1918 private address in, say, a "Received:" header in
> is less of a problem, though the spammers who do it are actually better
> to cover their origins, there's no way to prevent it and no normal damage

> from doing it.

Unless the SMTP server used to proxy email through a firewall is able to
strip headers, it's unavoidable.
I would like to see that feature added to SMTP servers, however, I do hate
letting internal host names and addresses out.