[CentOS] sendmail question

Robert Heller heller at deepsoft.com
Wed Oct 21 20:09:50 UTC 2009


At Wed, 21 Oct 2009 14:26:05 -0400 CentOS mailing list <centos at centos.org> wrote:

> 
> >
> > >/
> > />>/ That's a few DNS timeouts.
> > />>/
> > />>>/ / I have 127.0.0.1 localhost in the /etc/hosts file.
> > />>/ />/ 
> > />>/ />/ Very odd, any thoughts?
> > />>/ /
> > />>/ Are you mailing to localhost?
> > />>/   
> > />/ I tried:
> > />/ mail panel
> > />/ mail panel at localhost <http://lists.centos.org/mailman/listinfo/centos>
> > />/ mail panel at localhost.localdomain <http://lists.centos.org/mailman/listinfo/centos>
> > />/ mail panel at machine.domain.com <http://lists.centos.org/mailman/listinfo/centos> (insert actual machine and domain)
> > />/ 
> > />/ All the above have the same slow 2 minute delay.
> > />/ 
> > />/ This is odd.
> > /
> > You still haven't answered how long nslookup takes to respond with these 
> > or your IP addresses.  I think sendmail will ask DNS for an MX record 
> > first because that's how mail is supposed to work - then if that fails 
> > it goes for an A record or your hosts file.
> >   
> Sorry - missed that one .
> 
> nslookup cnn.com comes back fast.
> 
> if I do nslookup mymachine.domain.com it comes back with error.
> 
> How do I make this resolve faster or something. I have no way to make an 
> MX record
> for this box. its all just local email. it never leaves the box.

You don't need a MX record.  BUT you *should* have a record in the
/etc/hosts file.  I'm assuming you do have an Ethernet card (just not
connected to anything at present), so you need a line like the
following in your /etc/hosts file.

192.168.250.1           sauron.deepsoft.com sauron

replace '192.168.250.1' with the IP address you configured your
Ethernet card to and 'sauron.deepsoft.com sauron' with
'mymachine.domain.com mymachine' (assuming mymachine.domain.com is your
hostname). 

> 
> Jerry
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>                                    

-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
heller at deepsoft.com       -- http://www.deepsoft.com/ModelRailroadSystem/
                                                                                                                        


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