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Re: RFC 974 - Mail Routing and the Domain System
- From: Studded
- Date: Tue Sep 15 16:54:05 1998
Michael J. Maravillo wrote:
> 'Just want to clarify something... is there a difference between:
> domain.com. MX 10 mx1.domain.com.
> domain.com. MX 10 mx2.domain.com.
> domain.com. MX 10 mx3.domain.com.
> mx1.domain.com. IN A 10.0.0.1
> mx2.domain.com. IN A 10.0.0.2
> mx3.domain.com. IN A 10.0.0.3
> domain.com. MX 10 mx.domain.com.
> mx.domain.com. IN A 10.0.0.1
> mx.domain.com. IN A 10.0.0.2
> mx.domain.com. IN A 10.0.0.3
> >From RFC 974:
> "...Note that multiple MXs may have the same preference value. In
> this case, all MXs at with a given value must be tried before any of a
> higher value are tried..."
> Is the behaviour the same with the round-robined configuration?
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.
For future reference you are better off asking at email@example.com,
which seems to be back up and running.
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