RE: [cobalt-developers] Mail Feed

["Steve Groom" <steve.groom@xxxxxxxxxx>]

Hello my client's sites are generally of the following format:

"A" record www.domain.com Qube IP address
"A" record domain.com same ip address
"A" record mail.domain.com mail server IP address
"MX" record domain.com mail.domain.com

This takes the mail to a seperate mail server. It also allows the visitor to
type domain.com (i.e. omit the www (add a site alias in the site settings
though)).

I have also had a number of problems recently with a Qube3 dns server
getting confused. The web settings did not match the information being
served by the DNS server.

Make the following checks using NSLOOKUP (I use the windows 2000 command
line version)

nslookup
:server your.dns.server  (also run againsts external web servers to see how
you look from the outside)
www.domain.com
 - returns an address
:domain.com
 - returns an address
:mail.domain.com
 - should return the mail server address
:set type=mx
domain.com
 - should return the mail handling stuff

I kept seeing two IP addresses for the mail server, so about half of the
mail would not get through.

My solution was to delete all the records for the problem domain using the
Qube's GUI and recreate it. This has generally worked, but there is not much
you can do about irate customers who are getting complaints from their
customers that they can't send mail. They have to wait until their
customer's DNS cache has refreshed - often about 48 hours.

best regards
Steve Groom


> -----Original Message-----
> From: cobalt-developers-admin@xxxxxxxxxxxxxxx
> [mailto:cobalt-developers-admin@xxxxxxxxxxxxxxx]On Behalf Of Alec
> Woolford
> Sent: 17 January 2002 16:52
> To: cobalt-developers@xxxxxxxxxxxxxxx
> Subject: [cobalt-developers] Mail Feed
>
>
> I have been asked to redirect the mail for one domain on a RAQ 4 to an
> exchange server.
>
> I 've set up what i believe are the correct DNS settings:
>
>    mydomain.com  -> IP ADDRESS of web server
>
>    www.mydomain.com  -> IP ADDRESS of web server
>
>    mail.mydomain.com -> IP ADDRESS of exchange Server
>
>    www.mydomain.com -> mail.mydomain.com
>
>
> When I send an email to someone at that domain through our mail server on
> same domain i get the message:
>
>    Host unknown (Name server: mydomain.com: no data known)
>
> When someone send mail externally the following mesage is returned:
>
>    A message that you sent could not be delivered to one or more of its
>    recipients. This is a permanent error. The following
> address(es) failed:
>
>   person@xxxxxxxxxxxx
>     SMTP error from remote mailer after RCPT
>   TO:<person@xxxxxxxxxxxx>:
>     host mydomain.com[IP ADDRESS]: 550 5.7.1
>   person@xxxxxxxxxxxxxxx Relaying denied.  Please check your mail first.
>
>
> Has anyone got any ideas why the above would not work?
>
> Any ideas/help would be much appreciated.
>
> Alec
>
>
>
>
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>