*BSD News Article 83058


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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: HELP, REWARD!!!  Sendmail and DNS!
Date: 17 Nov 1996 08:45:25 GMT
Organization: Private BSD site, Dresden
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exuviae@intersurf.com wrote:

>   When i do an 
> nslookup of mail.trans-actions.com, you get mail.trans-actions.com
> 206.124.201.2..great, but when you nslookup from another server
> outside of our lan to the same machine you get nothing..

You're sounding totally confusing.

Make sure that:

. your nameserver is the delegated one, or the delegated one for your
  zone has data about your machine, or your nameserver mirrors the
  delegated server for your zone;

. you have an entry in both, the forward (trans-actions.com), and the
  reverse (202.124.206.in-addr.arpa) zones;

. you don't have other data for names that have CNAME records.

Btw., it's a good idea to have mail.trans-actions.com being an MX-only
entry, pointing to two or three different actual machines that are
willing to handle mail for your domain.  (Your example mentioned an A
record for this name, which is IMHO a bad idea.)

Also make sure your sendmail.cf is willing to accept things like
mail.trans-actions.com or trans-actions.com as being directed to
itself, or you'll get the sendmail error #1 (``Local configuration
error: MX record for ... points back to myself.'').  This is done via
Cw statements, or in the file mentioned as Fw in /etc/sendmail.cf.

-- 
cheers, J"org

joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)