Sendmail host name lookup failure

[Cameron Beattie]

Interesting. It seems to be related to reverse lookup as you suggested. I 
changed my sendmail.mc to include MASQUERADE_AS(`domainname.com')dnl and 
that seemed to work. I'm not sure that's what I want and maybe it was just 
coincidence so I will do some further testing and post back results.

Thanks for everyone's help.

Regards

CSB
----- Original Message ----- 
From: "Marcus O. White" <1lnxraider at comcast.net>
To: <fedora-list at redhat.com>
Sent: Thursday, May 26, 2005 10:41 PM
Subject: Re: Sendmail host name lookup failure


> Have you looked in the /var/log/maillog or /var/log/messages for
> additional information. This could also be a DNS issue, where the Yahoo
> mailserver attempts to perform a reverse lookup of the sending server.
> The other thing that you may want to do is use your ISP's mailserver as
> a "smart relay". This would require modifying your /etc/mail/sendmail.cf
> file.
>
> Marcus O.
>
> On Thu, 2005-05-26 at 09:17 +1200, Cameron Beattie wrote:
>> I have a number of undelivered messages in the mailqueue.  The mailqueue
>> reports: Deferred: Name server: yahoo.com.: host name lookup failure. I
>> attempted to send these emails from a remote client (Outlook Express) and
>> cannot understand why the domain name can't be discovered.
>>
>> nslookup yahoo.com.
>> Server:    210.55.12.1
>> Address:    210.55.12.1#53
>>
>> Non-authoritative answer:
>> Name:    yahoo.com
>> Address:    66.94.234.13
>>
>> echo test | sendmail -v user at yahoo.com
>> <snip>
>> 250 2.0.0 <.ID.> Message accepted for delivery
>> </snip>
>>
>> /etc/resolv.conf:
>> nameserver 210.55.12.1
>>
>> /etc/hosts
>> 127.0.0.1    servername    localhost.localdomain    localhost
>>
>> Don't know if the following is relevant
>> service nscd status
>> nscd is stopped
>>
>> Any help would be appreciated.
>>
>> Regards
>>
>> Cameron
>
> -- 
> Marcus O. White <1lnxraider at comcast.net>
>
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