[GLLUG] email troubles - lsd scnc server

[Dpk]

On Tue, Dec 03, 2002 at 02:24:35PM -0500, Michael Rambo wrote:

   [snip]
   
   [mrambo@mrambo mrambo]$ telnet scnc.lsd.k12.mi.us 25
   Trying 207.73.196.250...
   Connected to scnc.lsd.k12.mi.us (207.73.196.250).
   Escape character is '^]'.
   220 scnc.lsd.k12.mi.us ESMTP Sendmail 8.10.2/8.10.2; Tue, 3 Dec 2002
   08:17:24 -0500 (EST)
   helo scnc.lsd.k12.mi.us
   250 scnc.lsd.k12.mi.us Hello [207.73.232.115], pleased to meet you
   mail from: mrambo@lsd.k12.mi.us
   250 2.1.0 mrambo@lsd.k12.mi.us... Sender ok
   rcpt to: munged@munged.net
   550 5.7.1 munged@munged.net... Relaying denied. IP name lookup failed
   [207.73.232.115]
   
   The IP 207.73.232.115 is significant but I don't know where it
   comes from.
   [snip]

This is the IP address that the mail server sees... most likely it is
the external address of your NAT/Firewall system (or something that is
NAT'ing your own firewall!) Unless both the client and the mail server
are behind this box, it should never see a 10.x.x.x address.

The server is rejecting the connection because the IP address
207.73.232.115 does not resolve... a "feature" of new versions of
Sendmail.  This usually can be fixed by adding the IP explicitly to
the relay control in Sendmail or adding a DNS entry (assuming it will
relay for a given *.lsd.k12.mi.us host)

Dpk