Great Circle Associates List-Managers
(December 1996)

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Subject: Re: Aggregating on MX records
From: meo @ schoneal . com (Miles O'Neal)
Organization: Schober O'Neal, Inc / Net Ads
Date: Sun, 1 Dec 1996 22:32:58 -0600 (CST)
To: jbuckman @ shelby . com (John Buckman)
Cc: dcrocker @ brandenburg . com, list-managers @ GreatCircle . COM
In-reply-to: <> from "John Buckman" at Dec 1, 96 07:14:34 pm
Reply-to: meo @ schoneal . com (Miles O'Neal)

John Buckman said...
|A great many ISPs offer their corporate customers "virtual email
|domains", which exist only to offer a pretty email address with the
|customer's company name on it.  Thus, a number of seemingly
|different domains might point to the same mail server as their
|primary MX host.
|Thus, if you cache the MX records of DNS lookups of your subscriber
|list, and aggregate according to those MX records, (, as
|opposed the domain portion of the email address, say you'll
|have a higher success rate, and save yourself a considerable amount
|of time in avoiding those DNS lookups on every subscriber for every
|message to the list.  

So what happens when a mailhost reroutes mail
based on the domain?  For instance,
and might be different addresses,
where and are virtual domains on the
same system.


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