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Exchange Hosting - Split Domain Configuration

Summary

This article details how to setup a split domain based on mail server configuration.

 


 

Split Domain Configuration

Split domain implementations, while not recommended*, can address very specific client needs for a hosted environment. They can be used for the simultaneous hosting of basic and exchange email, hosted exchange accounts in conjunction with an internal or third party mail server, or a phased migration to exchange hosted services.

*Routing email through the basic mail server bypasses the Exchange mail server's Spam filters, and may result in increased Spam.

Split Domain Configuration For Hosted Basic & Exchange Mail.

In order for both Basic and Exchange mail services to coexist on the same domain, a split domain configuration is necessary. Without one both sets of servers will assume authority over the domain and thus prevent intra-domain emails between users on the different server types.

1. Change the mail exchange (MX) records for the organization's domain to point to the basic mail server.

  • mail01.netplexity.net

The MX records are configured within the DNS for a domain, residing with a domain registrar or the service control panel (only if nameservers are pointing to ITSN). For further instructions view the Basic Mail MX record knowledgebase article.

2. If not already in place, configure an Autodiscover record as detailed in the Autodiscover setup article.

3. Add an internal domain and create it using the following syntax orgid.ex.myhostedservice.net, for example, create an internal domain called itsn.ex.myhostedservice.net.

4. Add this internal domain as an accepted domain in the control panel.  To do so choose “Hosted Organizations” -- Choose your “Organization Name” --  On the left hand side choose “Accepted Domains” -- Choose the button “Add new Domain Name” -- then add the domain created in step 3 above orgid.ex.myhostedservice.net

5. Create a secondary email address for each Exchange user using the domain created in step 3 above. The built in domain will be in the format of orgid.ex.myhostedservice.net, and is available to add as an alias for each user. Reference the alias creation instructions on how to add an alias. (Note: Do not set the internal domain alias as the primary alias, use the alias for the domain that is split)

 

6. Access the basic mail section of the services control panel, and create mail aliases for every Exchange user under the domain in the split domain configuration, forwarding to the internal domain. For example exchangeuser@mydomain.com would be created as an alias on the basic mail side forwarding to exchangeuser@orgid.ex.myhostedservice.net. Please view the article on how to create a basic mail alias.

7.  Set your domain as an internal relay by following these instructions.

Split Domain For Internal or Third Party Mail Servers & Phased Migrations.

An alternative Split Domain form allows for the hosting of exchange mail users with ITSN, while using an existing mail server elsewhere (this may be with another hosting provider or internal company servers).

1. If not already in place, configure an Autodiscover record as detailed in the Autodiscover setup article.

2.  Add an internal domain and create it using the following syntax orgid.ex.myhostedservice.net, for example, create an internal domain called itsn.ex.myhostedservice.net.

3.  Set your MX records for the new domain orgid.ex.myhostedservice.net to mx01.myhostedservice.com (priority 10) and mx02.myhostedservice.com(priority 20) in the Control Panel. Do so by choosing “Domains” --Select the domain “orgid.ex.myhostedservice.net” -- Choose “Edit DNS Zone records” and add your MX records accordingly.

4. Add this internal domain as an accepted domain in the control panel.  To do so choose “Hosted Organizations” --Choose your “Organization Name” --  On the left hand side choose “Accepted Domains” -- Choose the button “Add new Domain Name” -- then add the domain created in step 2 above orgid.ex.myhostedservice.net

5. Create a secondary email address for each Exchange user using the built in domain. The built in domain will be in the format of orgid.ex.myhostedservice.net, and is available to add as an alias for each user. Reference the alias creation instructions on how to add an alias. (Note: Do not set the internal domain alias as the primary alias, use the alias for the domain that is split)

 

6. Forward mail from the external mail server, to the built in domain alias for each exchange user.

7. Change the authoritative feature of the domain from the exchange server to InternalRelay as described here.

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