Re: Sendmail host name lookup failure

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@xxxxxxxxxxx>
To: <fedora-list@xxxxxxxxxx>
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@xxxxxxxxx
<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@xxxxxxxxxxx>

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