MX question

Barry Margolin barmar at genuity.net
Tue Apr 9 19:19:08 UTC 2002


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.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
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