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Clients download Emails from other exchange servers.

Posted on 2016-08-11
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Last Modified: 2016-09-15
We are running Exchange 2007 SP3, and we have 3 Exchange Servers in three different countries.

Our data usage is flying up with some of our clients download email through other email Exchanges Servers.

Some users in particular seems to be hitting different exchange servers a lot ( Found that out from Bluecoat report. ), It isnt everyone however.

How can i know what is causing so much auto discover traffic and then exchange going via the wrong server?

Thanks.
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Question by:Leo
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by:Alexandre Michel
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Are you saying that Outlook is getting data from WRONG servers or that users are setting up extra mailboxes to other 3rd party Exchange server you don't manage?
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by:ScottCha
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Are they possibly in one country while the Exchange server that hosts their mailbox is in a different country?
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by:Alexandre Michel
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Re-reading your question, you have 3 exchange servers, in 3 differents sites.
Some users are getting connected to an Exchange server that is not local to them. Is that correct?
Did you set up your servers for High availability?
Is each site set up as a separate Organization?
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by:Leo
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mailboxes are hosted in their respective countries.

Yes, thats right some users are getting connected to exchange server which is not local to them.

servers are not setup as HA and each site is setup as a separate organization.
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by:Davis McCarn
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If all of the users are @thesamedomain.whatever, you're having a DNS lookup problem and you may have no choice but to add an entry to the Windows host file on each PC: http://en.wikipedia.org/wiki/Hosts_file, which will make Windows use the IP address you specify instead of querying DNS when resolving the exchange server.

For example:
192.168.0.254   my_exchange_server.domain.local
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by:Jian An Lim
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the question is interesting as i have no idea how the setup is installed

can you explain how your exchange setup and what the email address for each country?
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by:Leo
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Running exchange 2007 with latest security pack.

3 sites totally independent of each other on exchange, but in AD all come under one forest.

one Exchange site is in Australia, one in PNG, one in fiji....

I have been advised that the issue can be with the auto-discover DNS?

but as Davis suggested its related to DNS not resolving the exchange name and exchange ip needs to be added to each computer host file.....

so i am confused....
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by:Davis McCarn
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An entry in the HOSTS file ought to override any issue with autodiscover as the ip for their server will be present.
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Jian An Lim earned 250 total points
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Thanks Leo for your input.

ON ID: 41756300, putting HOSTS file will definitely work but i think it goes too far to every computer.
Every different country's HOST file will be different.


what you looking for is a "Geo-Location Based Traffic Management". This is a new feature in windows 2016  https://blogs.technet.microsoft.com/networking/2015/05/11/geo-location-based-traffic-management-using-dns-policies/

so, assuming you are using 2008 server. you might want to look at subnet Prioritization
https://technet.microsoft.com/en-us/library/cc961422.aspx

If not, you might want to setup a local dns (a new dns zone that not store the zone in active directory) and create an autodiscover.<domain> that point to their local exchange server at their local dns server.
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by:Leo
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Thanks all for your comments, I will test what you have suggested and get back to you.....
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by:Leo
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@ Jian, Any article on the last suggestion which you recommended?

"If not, you might want to setup a local dns (a new dns zone that not store the zone in active directory) and create an autodiscover.<domain> that point to their local exchange server at their local dns server."
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by:Jian An Lim
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Hi Leo,
The idea is using pinpoint dns but not using active directory integrated. it will be unique on every domain controller at the site so you will able to choose whatever dns record you in

http://www.msexchange.org/articles-tutorials/exchange-server-2010/mobility-client-access/using-pinpoint-dns-zones-exchange-2010.html
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by:Leo
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Thanks, can it be done for individual users? because only few users are experiencing this issue, not the whole site.
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by:Jian An Lim
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Sure,
use ID: 41756300 solutions - adding the item into the HOSTS file of each computer
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