> If the list manager is really clever, it will discover that the
> physical machine to send to is ng.netgate.com and will try to
> aggregate on that; but I doubt there are many recipients for
> list-managers on that machine, either.
Actually, that technique works quite well and is quite
implementable. You'll get much better aggregation results if you
aggregate based on the MX hosts rather than the physical hostname of
the email address.
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, (mail.isp.net, as
opposed the domain portion of the email address, say isp.net) 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.
John
john@shelby.com, Shelby Group Ltd., http://www.shelby.com/
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