Hi all,
If you have two same weight(preference) MX records, will inbound emails
load-balance each other? if one fails, will it relay mails to the second one?
If you have two smart hosts on the connector, will it automatically
load-balance each other?
thank you.
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 Utf
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6/29/2010 5:43:20 PM |
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On Tue, 29 Jun 2010 10:43:20 -0700, ed <ed@discussions.microsoft.com>
wrote:
>If you have two same weight(preference) MX records, will inbound emails
>load-balance each other?
That depends on the DNS and the resolver. If DNS uses "round-robin"
the answer would be "probably", but it's still up to the transmitting
client to pick an address from the set of results returned by the
query.
>if one fails, will it relay mails to the second one?
Usually, yes. But it won't "relay", it'll just send the mail to the
next hop.
>If you have two smart hosts on the connector, will it automatically
>load-balance each other?
I wouldn't depend on that. Load balancing is a lot more than just
flip-flopping between a pair of IP addresses.
---
Rich Matheisen
MCSE+I, Exchange MVP
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Rich
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6/29/2010 11:29:08 PM
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Rich,
thank you. sorry and I change my questions as follows:
>If you have two same weight(preference) MX records, will inbound emails >randomly be accepted by each MX record? (check the yahoo's mx records and all >have the same weight)
> If you have two smart hosts on the connector, will mails randomly be sent out to each smart host?
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Utf
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7/2/2010 7:00:30 PM
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On Fri, 2 Jul 2010 12:00:30 -0700, ed <ed@discussions.microsoft.com>
wrote:
>thank you. sorry and I change my questions as follows:
>
>>If you have two same weight(preference) MX records, will inbound emails >randomly be accepted by each MX record? (check the yahoo's mx records and all >have the same weight)
The answer is still "it depends".
If your DNS uses round-robin then the answer to each query will put a
different MX record in the 1st position. If the client uses the 1st MX
in the answer then you have a rough form of connection distribution
(but not really "load balancing").
You can accomplish the same thing with just one MX, though. For
example:
domain.com. IN MX 10 mail.comain.com.
mail.domain.com. IN A 1.2.3.4
mail.domain.com. IN A 1.2.3.5
>> If you have two smart hosts on the connector, will mails randomly be sent out to each smart host?
Not randomly, but certainly to both.
---
Rich Matheisen
MCSE+I, Exchange MVP
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Rich
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7/2/2010 9:29:12 PM
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