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From: bv@wjv.comREMOVE (Bill Vermillion)
Subject: Re: Sendmail, DNS, MX records configuration
References: <d1f73d90.0211150018.bee9763@posting.google.com> <Pine.LNX.4.44.0211151129460.12743-100000@news.mebay.biz> 
Date: Sat, 16 Nov 2002 06:58:48 GMT

In article <Pine.LNX.4.44.0211151129460.12743-100000@news.mebay.biz>,
John Schmidt  <a.dingo@mebay.biz> wrote:
>
>On 15 Nov 2002, James Szabadics wrote:

>> I think I need a local MX record for ourdomain.com.  I looked around
>> on Tonys FAQ and think I just need to add two lines for MX records to
>> an appropriate area possibly named.conf???  Is this correct I am
>> really not sure as I am a complete newbie to MX records and DNS.

>> ourdomain.com.    IN      MX      10 mx.ourdomain.com.
>> mx.ourdomain.com. IN   A       10.x.x.x

>> where x.x.x are valid numbers for the exchange server

>This will only work if you're running your a seperate DNS view the
>rest of the world can't see - i.e. a DNS server limited so that only
>your internal masqueraded 10.*.*.* hosts can see it. Please don't
>propogate any DNS info containing dummy IP information to the
>rest of the world. If you're comfortable running DNS servers, this
>wouldn't be that big a deal to implement.

>However, it would probably be easier to set this up in sendmail
>itself. Three possible solutions:

[deletia]

>2) Use the "virtusertable" feature in sendmail. This would probably
>   require a rebuild from source of your sendmail.cf file. This has
********************* see note
>   the same basic weakness as the alias method, but does give a bit
>   more fine-grained control.
>
>3) Use the "mailertable" feature in sendmail. This would almost
>   certainly require the above mentioned rebuild of sendmail.cf, but
****** see note
>   would allow you to build a rule stating  'all mail with a
>   recipient address in domain.com gets delivered to server.domain.com
>   regardless of MX refcord information.'

>For the sendmail methods, the documentation bundled with the sendmail
>source gives specifics for all three methods. The sendmail.org
>website also has an awful lot of good information.

You might not have to rebuild sendmail depending on how it was
built the first time. Look at the existing sendmail.cf and
see if in the top lines there is a reference to mailertable
and virtusertable.  If there then there is no need for rebuilding
the sendmail.cf.

I don't think I've ever seen a sendmail without the mailer table
entry in the past 15 years.  That was what you needed to get email
transfered with uucp - which was pretty much the standard then.

Bill

-- 
Bill Vermillion - bv @ wjv . com
 

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