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From: phil@inetg1.Arco.Com (Phil Meyer)
Newsgroups: comp.mail.sendmail,comp.sys.sgi
Subject: Re: Host Name Lookup Failure in testmode
Keywords: sendmail configuration, testing, setup
Message-ID: <344@inetg1.arco.com>
Date: 26 Nov 90 19:51:33 GMT
References: <1195@syacus.acus.oz>
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Organization: Arco Oil & Gas Company
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In article <1195@syacus.acus.oz>, grants@syacus.acus.oz (Grant Sayer) writes:
> With testing a connection between two machines (host1 and host2)
> using 'sendmail -v user@host1 < /dev/null' the SMTP connection works
> one way and not the other.  For example, 
> 	1. sendmail -v user@host2 < dev/null  (from host1)
> 		- results in mail transferred and normal 250 greeting messages
> 
> 	2. sendmail -v user@host1 < /dev/null (from host2)
> 		- results in error message
> 		user@host1: Deferred Host name lookup failure.
> 
> 
> Any suggestions as to why the problem is only one-way ?
> 

We have seen similar problems when running Yellow Pages, or otherwise when
the /etc/hosts files do not match.  Some systems (SGI 3.3.1) sendmail does
NOT use Yellow Pages correctly.  In our case, and possibly in yours, the
CRrelay entry (where relay=relay host) was the sticker.
The machine who is designated as the relay host, MUST appear in the local
/etc/hosts file.

Hope this helps.
-- 
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| Phil Meyer         phil@arco.com  Work:(214) 754-6805  Home:(214) 625-4130 |
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