Trying to send external mail to a local sendmail box

[Joseph S D Yao]

On Sun, Mar 12, 2000 at 06:05:39PM +0000, nsyte wrote:
> I need some help. I am running sendmail on a local machine
> (ion.somedomain.com) separated by a packet filtering firewall
> (gateway.somedomain.com), and I have an external DNS (authoritative for
> somedomain.com). The DNS MX records point to gateway; gateway forwards
> all port 25 traffic to ion.
> 
> Because the mail servers of the world will not accept mail from a non-
> existent host, I set up the external DNS records to alias ion to
> gateway. Now I can successfully send mail out.
> 
> I can telnet to port 25 of ion and manually construct a mail session;
> however, when I address mail from an external client to
> user at somedomain.com or user at ion.somedomain.com, I get the messages
> below.
> 
> It does not appear that the mail is getting past gateway. Do I have the
> DNS set up correctly? I cannot point the MX records to anything besides
> gateway. It should forward mail traffic to ion, right?
> 
> Where is the problem?

Don't have both machines named "ion".  That is asking for trouble.

Have the real "ion" change outgoing e-mail addresses from
"user at ion.somedomain.com" to "user at somedomain.com".  I assume that it
already accepts incoming "user at somedomain.com" addresses.

-- 
Joe Yao				jsdy at cospo.osis.gov - Joseph S. D. Yao
COSPO/OSIS Computer Support					EMT-B
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