Re: Strange sendmail behaviour

[Todd Davis <tdavis@msfw.com>]

I don't know if it's causing your problem, but I seem to remember that
MX records must be names with corresponding A records.  They cannot be
CNAMEs.  If I remember correctly a "local configuration error" is the
message you'll get when configured with CNAMEs.


On Tue, 2003-05-06 at 18:23, Marcelo Medici wrote:
> I have an interesting sendmail scenario. I am testing out MX records in a
> lab. I have three hosts:
> 
>  a.test.lab
>  b.test.lab
>  c.test.lab
> 
> b and c both act as secondary mx for a. each has a dns entry. they each
> also have cname entries as mx1.test.lab and mx2.test.lab respectively.
> 
> dns is configured for db.test.lab as
> 
> @	IN	MX 10 a.test.lab
>      	IN	MX 20 mx1.test.lab
> 	IN	MX 30 mx2.test.lab
> 
> i test their ability to act as secondary mail server by sending a message
> with the following as the recipient:
> 
>  gaucho%test.lab@b.test.lab
> 
> this works properly and the mail arrives to a.test.lab in the gaucho
> inbox.
> 
> oddly, when i send a message to
> 
>  gaucho%test.lab@mx1.test.lab
> 
> the message is bounced saying that there is a local configuration problem
> on the mx1 machine. neither b.test.lab nor mx1.test.lab have reverse
> lookup entries in dns. i had at first thought that there was a problem
> with forward and reverse entries not matching. this does not seem to be
> the case.
> 
> Each secondary machine is configured with a /etc/mail/relay-domains with a
> single line:
> 
> test.lab
> 
> I have also tried using the /etc/mail/access file as a relay authority
> with
> 
> test.lab RELAY
> 
> in the file. Still, same outcome.
> 
> Each machine has an empty /etc/mail/local-host-names
> 
> Can someone provide insight as to what is occurring and how to fix this
> such that mail sent to @mx1.test.lab will properly be relayed? All
> machines are running RedHat 7.3 and the lastest patched sendmail RPM
> available from RedHat.
> 
> Thank you.
> 
> 
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-- 
Todd Davis (tdavis@msfw.com)
Red Hat Certified Engineer (RHCE #807101281603181)


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