October 11, 2008 07:32pm pdt

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	[x] Attachment Details

relaying denied IP name lookup failed

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7.0

Zone: Email Software

Tags: lookup, name, ip, failed, relaying

I've been through every question on the board about the 5.7.1 NDR but the solutions are not working.

Here's the skinny:

I am in the military and my unit sets up deployable servers during contingency operations. We have a new set of equipment running windows 2003 enterprise server and Exchange 2003 standard server. We have sidewinder 5.2.1 firewall and a router configured for 3 subnets 192.168.14.0, 192.168.11.0 and 192.168.20.0. The 20 subnet has an external DNS server (not a fake root host) which has info for each of the external burbs of the firewalls (14.0 and 11.0) and MX records for both.

When we try to send mail from the outlook client on one domain to a client on the other domain we recieve a NDR. specifically
SMTP 550 5.7.1.
You do not have permission to send to this recipient
relaying denied IP name lookup failed (IP of the mailserver)

When I do an nslookup and put in IP addresses, they resolve for all of the machines on my networks. So I don't understand at what point the IP name lookup failed.

I've also ensured that the relay access list is on authentication and that every computer on the mail server's class B is on there (192.168.0.0) and it still denies.

since this is training for what we do out in the field, we were following the manuals sent from the government contracted corporation, however, I really want to get this to work.

I've gone through all the common aspects of the exchange portion and I was thinking it might have something to do with the firewall, but I have no way of tracking down where the mail goes.

Any help would be appreciated.

Chris

	#	Title
	1	Relaying Denied
	2	Open Relay Mystery
	3	572 Relay not authorized
	4	SMTP: relay to a relay to a server
	5	frame relay
	6	#5.7.1 smtp;550 5.7.1 U…