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Article #5737

Re: DNS confusion

#5737
From: James Lick
Date: Sun, 23 Nov 1997 00:00
29 lines
1700 bytes
No, MX records don't work that way.  All systems listed as MXs must know
how to forward on the mail to the final destination.  Usually the lowest
MX is the final destination.  Your MTA (e.g. sendmail) will try to connect
to the lowest MX first, then it goes on to a higher MX only if the mail is
deferred (i.e. connection refused, connection timed out, temporary error,
etc.).  If the MTA gets a bounce or other permanent error, it stops and
bounces the mail.  In other words, once it gets a definitive success or
error, the MTA stops attempting delivery.

On Sat, 22 Nov 1997, hedon wrote:
>           If I send a mail to a user on host2,  it never gets handled by
> 
> host2 and is  always bounced by host 1. ( user not found )
>           I believed, that if the user is not found on a mail server
> with
> higher priority , the mail
> is  subsequenly sent to a server with higher preference number  [
> lower priority   :-)    ]   Is it a sendmail problem?
>          The mail would be in this form      user@mydomain.com
> 
>                     mydomain.com.            IN  MX      10
> host1.mydomain.com.
>                     mydomain.com.            IN  MX      20
> host2.mydomain.com.



-- James Lick -- jlick@drivel.com -- http://drivel.com/jlick/ --
Technical Details
Message-ID: <inet-access.Pine.GSO.3.96.971123110924.28508C-100000@tcp.com>
Path: arc1-ca.pugleaf.net!unknown!not-for-mail

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From: James Lick <jlick@drivel.com>
Subject: Re: DNS confusion
Date: 1997/11/23
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