From owner-freebsd-stable@FreeBSD.ORG  Sat Mar 27 14:21:48 2004
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Date: Sat, 27 Mar 2004 14:22:04 -0800
From: Claus Assmann <freebsd+stable@esmtp.org>
To: chris65@wi.rr.com
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References: <9c2a599374.993749c2a5@rdc-kc.rr.com>
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cc: stable@freebsd.org
Subject: Re: sendmail non-recoverable error
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On Sat, Mar 27, 2004, chris65@wi.rr.com wrote:
> Have been searching Google to no avail and couldn't find anything on the sendmail web site, so I'm hoping you can help.
> 
> Please cc: me in replies as I am not subscribed.  Thank you so much.

I'll try to but AFAIK rr.com blocks my mails... all
these helpful anti-spam measures...

> Mar 27 14:52:23 xxxx sendmail[28381]: i2RKqN8N028381:
> i2RKqN8O028381: DSN: Host unknown (Name server: localhost:
> non-recoverable error)

localhost unknown? Hmm, that's unusual...
Anyway, try to upgrade your submit.mc file:

8.12.7/8.12.7	2002/12/29
...
	CONFIG: Use FEATURE(`msp', `[127.0.0.1]') in submit.mc by default
		to avoid problems with hostname resolution for localhost
		which on many systems does not resolve to 127.0.0.1 (or
		::1 for IPv6).  If you do not use IPv4 but only IPv6 then
		you need to change submit.mc accordingly, see the comment
		in the file itself.