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Re: Localized mail servers, global scope

  • From: william(at)elan.net
  • Date: Thu Jun 23 09:09:09 2005


On Thu, 23 Jun 2005 Michael.Dillon@btradianz.com wrote:

You don't need a central MX if each site MTA knows which users are at
which sites. Incoming email may have to take an extra hop if it comes in
to the wrong site, but that's a consequence of the specification that no
implementation can fix.
In other words, SMTP does not have the equivalent of an
HTTP redirect which is what he wants here. Maybe SMTP
really is broken? ;-)
HTTP is 100% client-server protocol so redirect is server telling client to go somewhere else (which is exactly what HTTP redirect does).

But SMTP is store-forward system like ip itself. In store-forward redirection is changing of connection path by intermediate system.
So with ip this is handled by routers and transparent proxy servers.
In SMTP this is handled by forwarding systems which change mail
transmission connection and redirect and pass message somewhere else.

So we do have redirect functionality SMTP, its just not done same
way as HTTP because of differences in system infrastructure.

P.S. Somewhat related work of mine:
http://www.elan.net/~william/emailsecurity/draft-leibzon-emailredirection-traceheaders-01.html

--
William Leibzon
Elan Networks
william@elan.net




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