In this part, we will have a look on the Accepted Domains and Remote Domains in Exchange Server 2013. So what are Accepted Domain and Remote Domain?
Accepted Domain:
An Accepted Domain name is any SMTP namespace that your organization used to send and receive emails. Also the Accepted Domain includes the domains that are authoritative domain, internal relay or external relay domain.
Authoritative Domain – It is the SMTP name space that is used by your Exchange Organization to send\receive emails
Internal Relay Domain – When an Exchange Organization is sharing the same address space with 3rd party messaging or other exchange organization, the you need to create a internal relay domain, and you have to configure a Send Connector in Mailbox Server as the source with address space matches to the internal relay domain.
For example: If your company (A) and your partner company (B) is sharing the same SMTP namespace as @Chennai.com and your domain is authoritative to receive emails for Chennai.com. If an email sent for the user rajkumar@chennai.com first received by A and if the user mailbox is not there, then the email will be route to B organization using Send Connector
External Relay Domain – When you configure an external relay domain, messages are relayed to an email server that’s outside your Exchange organization and outside the organization’s network perimeter
By default the active directory domain name will be created as the default accepted domain for the Exchange Organization

How to create a new Accepted Domain in Exchange Server 2013
To create a new Accepted domain, login to Exchange Control Panel -> Mail Flow -> Accepted Domain and Click New (+) -> Give a Name -> type the accepted domain name -> Choose the Type of Accepted Domain and Click Save

Remote Domain:
Remote Domains are configured to control the settings of message transfer between your Exchange Organization and the remote domains. We control the settings like Message Format, Automatic Replies and NDR using the Remote domains

By default, a Remote Domain with * which includes all domains will be created and the creation of new remote domains and the configurations can be only done via Exchange Management Shell and not using Exchange Admin Center. Below are the configurable parameters using Set-RemoteDomain

Accepted Domain:
An Accepted Domain name is any SMTP namespace that your organization used to send and receive emails. Also the Accepted Domain includes the domains that are authoritative domain, internal relay or external relay domain.
Authoritative Domain – It is the SMTP name space that is used by your Exchange Organization to send\receive emails
Internal Relay Domain – When an Exchange Organization is sharing the same address space with 3rd party messaging or other exchange organization, the you need to create a internal relay domain, and you have to configure a Send Connector in Mailbox Server as the source with address space matches to the internal relay domain.
For example: If your company (A) and your partner company (B) is sharing the same SMTP namespace as @Chennai.com and your domain is authoritative to receive emails for Chennai.com. If an email sent for the user rajkumar@chennai.com first received by A and if the user mailbox is not there, then the email will be route to B organization using Send Connector
External Relay Domain – When you configure an external relay domain, messages are relayed to an email server that’s outside your Exchange organization and outside the organization’s network perimeter
By default the active directory domain name will be created as the default accepted domain for the Exchange Organization

How to create a new Accepted Domain in Exchange Server 2013
To create a new Accepted domain, login to Exchange Control Panel -> Mail Flow -> Accepted Domain and Click New (+) -> Give a Name -> type the accepted domain name -> Choose the Type of Accepted Domain and Click Save

Remote Domain:
Remote Domains are configured to control the settings of message transfer between your Exchange Organization and the remote domains. We control the settings like Message Format, Automatic Replies and NDR using the Remote domains

By default, a Remote Domain with * which includes all domains will be created and the creation of new remote domains and the configurations can be only done via Exchange Management Shell and not using Exchange Admin Center. Below are the configurable parameters using Set-RemoteDomain

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