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Exchange Hosting - Split Domain Configuration

Prerequisites

Active Archiving services, see Add Hosted Services.

 

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 enviornment. They can be used for the simulataneous 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. Please reference the respective sections within this article for setup instructions.

*Routing email through the basic mail server can result in delivery delays.

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. The configuration required to correct this involves routing external mail through the basic mail server, adding forwards for exchange mail users on the basic mail server, and then removing the authoritative feature from the exchange server.

 

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. Create a secondary email address for each Exchange user using the built in domain. The built in domain will be in the format of organization.myhostedsolution.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)


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4. 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@mydomain.myhostedsolution.net. Please view the article on how to create a basic mail alias.

 

5. Remove the authoritative feature of the domain from the exchange server as, instructed here.

6.  There are some adjustments that will need to be made on the servers.  Please open a support ticket so the Exchange Engineers can complete the configuration.


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). This configuration will require removing the authoritative feature of the target domain from the ITSN exchange server, and forwarding mail from the external server to the internal built in domain alias of the target mailboxes.

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

2. Create a secondary email address for each Exchange user using the built in domain. The built in domain will be in the format of organization.myhostedsolution.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)


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

4. Remove the authoritative feature of the domain from the exchange server as, instructed here.

5.  There are some adjustments that will need to be made on the servers.  Please open a support ticket so the Exchange Engineers can complete the configuration.


 

What Is Next?

Autodiscover For Exchange 2010

Add An Email Alias

Forward A Basic Mail Account
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