[GLLUG] email troubles - lsd scnc server

[Mike Szumlinski]

I had a similar problem back with my OS X Server and the crappy built 
in SMTP server on it.

It came down to me having to authenticate to send mail and adding 
127.0.0.1 and localhost to allowed relays in the SMTP server settings.  
I was sending test e-mails to mac.com and it said it would not resolve 
the ip of "mac.com", even though doing an nslookup on the same machine 
brought back the IP just fine.

Are you authenticating now? Is the server set to be an open relay 
(probably not)?

Dunno if this helps at all, but the error is nearly identical to what I 
was getting back in the day.

-Mike


On Tuesday, December 3, 2002, at 07:28  PM, Dpk wrote:

> 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
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