I am running Exchange 2013 on Windows Server 2012 R2.

When I add my exchange account to Outlook, it seems to work perfectly (sending/receiving email, syncing everything), but when I open the account settings it has the following set as the Server:


I would have expects this to be: mail.domain.com since this is the DNS A record pointing to the IP of my server. Where is it getting this server name?


This is the new RPC proxy endpoint. There is more information in this blog post on the microsoft website. Just a short quote from the article:

We no longer use a FQDN for the RPC endpoint. Instead we now use a GUID. The mailbox GUID, to be precise (along with a domain suffix to support multi-tenant scenarios).

There is another article which might be of interest for you.

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  • Interesting - I'm reading through the articles (it is just slightly over my head but I am following it for the most part) - so how do they map the GUID to the IP? Is there some sort of centralized GUID DNS service? – William Nov 10 '13 at 17:44
  • I think your answer is in the blog post in the section "Outlook Connectivity" after the image. There is no direct mapping to the IP. It is more a mapping to the mailbox store where the mailbox resides. So you need to find out where the mailbox is and then you have the IP. – Raffael Luthiger Nov 10 '13 at 23:28

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