From: Clifton Royston (cliftonrlava.net)
Date: Wed Mar 05 2003 - 19:37:46 CST

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On Sat, Mar 01, 2003 at 11:30:21AM -0600, Will Simpson wrote:
> I too am having some relaying issues.
> I get a few of these messages from both my corporate mail server and my list
> server.
>
> croftergte.net>: host dca1-mx.mail.algx.net[204.91.241.16] said: 550 5.7.1
> <croftergte.net>... Relaying denied. IP name lookup failed
> [xxx.x.xx.xxx]
> (in reply to RCPT TO command)
>
> <ekleinusb.ve>: host dca1-mx.mail.algx.net[204.91.241.15] said: 550 5.7.1
> <ekleinusb.ve>... Relaying denied. IP name lookup failed [xxx.x.xx.xxx]
> (in reply to RCPT TO command)
>
> The "IP lookup failed" IP is my firewalls IP `[xxx.x.xx.xxx]` and the
> dca1-mx.mail.algx.net[204.91.241.16] IP is my back-up mail server (we were
> off line a bit this morning. But I get them from all over. I even get them
> from a form based e-mail that is being submitted by our external web server
>
> What do I need to do to fix this?
 
  It sounds like you do not have proper reverse DNS for your firewall
IP. You need to set up a reverse DNS (PTR record) for the IP address
in question, or more likely get your ISP to do so.

  -- Clifton

--
     Clifton Royston -- LavaNet Systems Architect -- cliftonrlava.net

  "If you ride fast enough, the Specialist can't catch you."
  "What's the Specialist?" Samantha says.
  "The Specialist wears a hat," says the babysitter. "The hat makes noises."
  She doesn't say anything else.
                      Kelly Link, _The Specialist's Hat_

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