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Re: RFC 974 - Mail Routing and the Domain System

  • From: Studded
  • Date: Tue Sep 15 18:52:42 1998

Phillip Vandry wrote:
> >       My imperfect understanding of how most mail agents handle MX records is
> > that with the first configuration, mx1 will always be tried first,
> > followed by mx2, etc. With the second configuration, a BIND server will
> > return the A addresses in an effectively random pattern, so load should
> > be distributed across the 3 servers.
> Indeed if the MXes have different priorities, only in this case they have
> the same priorities so they will also be load balanced. (The key being,
> BIND will round robin any kind of record, not just A records).

	BIND will round robin the MX records, how mail agents deal with
multiple MX records of the same priority is less of a known factor (to
me at least). Actually I'd be interested to hear from people who try
both configurations for say a month at a time to see what influence each
configuration has if any.

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