On Mon, 24 Nov 1997 12:44:04 +0000 (GMT),
Chris Jewell <jewell@jewellce.es.dupont.com> wrote:
> 
>      I had posted originally that I could not get mail from the outside
> world to my MacIIci behind a firewall.  Well, I am sending mail from it
> right now and I have been able to receive mail.  All I did was enable
> snedmail in the netstart file.  All is well.

And I see an MX host for the host jewellce.es.dupont.com.  That's why
it works even though your Mac's behind a firewall.

--<excerpt from output of host>--
The following answer is not authoritative:
jewllce.es.dupont.com   85161 IN        MX      20 gatekeeper.es.dupont.com
For authoritative answers, see:
ES.DUPONT.com   85161 IN        NS      gatekeeper.es.dupont.com
ES.DUPONT.com   85161 IN        NS      knock.ser.bbnplanet.net
Additional information:
gatekeeper.es.dupont.com        171528 IN       A       192.26.233.2
knock.ser.bbnplanet.net 171528 IN       A       192.239.16.129