This is a text-only version of the following page on https://raymii.org: --- Title : Exchange 2007 and 2010 Autodiscovery DNS SRV record for BIND Author : Remy van Elst Date : 09-05-2013 URL : https://raymii.org/s/tutorials/Exchange_2007_2010_Autodiscovery_DNS_SRV_record_for_BIND.html Format : Markdown/HTML --- Note: This article is targeted at *NIX administrators who have to manage Exchange installations, but are not Microsoft specialists. Therefore the BIND setup does not have an explanation, but the Exchange part has.

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### What is Exchange Autodiscovery Exchange 2007/2010 Autodiscovery is the ability for Outlook to automatically configure itself to an Exchange 2007/2010 server. The main benefit is for remote users to use Outlook on the Internet as if it was connected on the LAN, this is called Outlook Anywhere or Outlook RPC over HTTP. This is very easily accomplished by having a specific DNS record available for the domain. #### How does Exchange Autodiscovery work? Outlook has a few ways to look for domain information when configuring itself based on the users email address. Lets say I want to set up Outlook as `john.doe@example.org`, but my site does not have the required Autodiscovery XML files set up. I enter that email address in Outlook, now Outlook do the following things to get its information: * Autodiscover posts to https://example.org/Autodiscover/Autodiscover.xml. This fails. * Autodiscover posts to https://autodiscover.example.org/Autodiscover/Autodiscover.xml. This fails. * Autodiscover performs the following redirect check: GET http://autodiscover.example.org/Autodiscover/Autodiscover.xml. This fails. * Autodiscover uses DNS SRV lookup for _autodiscover._ tcp.example.org, and then "mail.example.org" is returned. * Outlook asks permission from the user to continue with Autodiscover to post to https://mail.example.org/autodiscover/autodiscover.xml. * Autodiscover's POST request is successfully posted to https://mail.example.org/autodiscover/autodiscover.xml. There are various reasons not to set up the Autodiscovery XML on the main website or the Autodiscover.example.org. Mainly because it requires extra certificates, IP addresses and maintenance. Maybe a company does not have Windows servers to host their main website, or they don't want the hassle. In those cases the DNS SRV record works very nice. ### BIND DNS Record The following record line should be put in your zone config file (`/etc/bind/example.org`): ; Exchange autodiscovery _autodiscover._tcp IN SRV 0 0 443 mail.example.org. After a `rndc reload` you should be able to use the Autodiscovery service without problems. It is tested with BIND 9.8. ### Sources [White Paper: Exchange 2007 Autodiscover Service][2] [A new feature is available that enables Outlook 2007 to use DNS Service Location (SRV) records to locate the Exchange Autodiscover service][3] [1]: https://www.digitalocean.com/?refcode=7435ae6b8212 [2]: http://technet.microsoft.com/en-us/library/bb332063.aspx [3]: http://support.microsoft.com/kb/940881/en-us --- License: All the text on this website is free as in freedom unless stated otherwise. This means you can use it in any way you want, you can copy it, change it the way you like and republish it, as long as you release the (modified) content under the same license to give others the same freedoms you've got and place my name and a link to this site with the article as source. This site uses Google Analytics for statistics and Google Adwords for advertisements. You are tracked and Google knows everything about you. Use an adblocker like ublock-origin if you don't want it. All the code on this website is licensed under the GNU GPL v3 license unless already licensed under a license which does not allows this form of licensing or if another license is stated on that page / in that software: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . Just to be clear, the information on this website is for meant for educational purposes and you use it at your own risk. I do not take responsibility if you screw something up. Use common sense, do not 'rm -rf /' as root for example. If you have any questions then do not hesitate to contact me. See https://raymii.org/s/static/About.html for details.