MX question

[Brian Dickson]

It probably has to do with Clustering of servers for failover.  We all =
know how stable Exchange is, and they'd like to keep their stuff up all =
the time.



Brian

>>> Barry Margolin <barmar at genuity.net> 04/09/02 02:19PM >>>
In article <a8vea1$230 at pub3.rc.vix.com>,
Kevin Darcy  <kcd at daimlerchrysler.com> wrote:
>Of course, I'm not so naive to think all implementations follow standards.=
 But
>it's hard to know what form of standards non-compliance Microsoft was =
trying to
>accommodate with this multiple-A scheme.

Didn't you see *my* part of the response:

>> > Some mailers have a limit on the number of equal-preference MX's that
>> > they'll try, possibly only one.  So if a server only tries one MX =
record,
>> > it will still see both addresses corresponding to that server, and =
may try
>> > both addresses.  If you had six MX records, only one address would be
>> tried
>> > in this case.

Doesn't that explain what they were trying to do?  I think you'll find =
that
quite a few sites that get enormous amounts of mail have their MX records
set up like Microsoft.  Take a look at aol.com, for instance; they have 4
MX records, which each have 4 A records.

--=20
Barry Margolin, barmar at genuity.net=20
Genuity, Woburn, MA
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