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We have added multiple authoritative domains to our Exchange environment. How does one set up a mailbox that is not the default domain? I am able to accept mail at any of the authoritative domains as long as it points to a default domain mailbox but I am at a loss on how to configure a mailbox that can send and receive on one of the other authoritative domains outside of AD. Is this possible?
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We have added multiple authoritative domains to our Exchange environment. How does one set up a mailbox that is not the default domain? I am able to accept mail at any of the authoritative domains as long as it points to a default domain mailbox but I am at a loss on how to configure a mailbox that can send and receive on one of the other authoritative domains outside of AD. Is this possible?

Exchange 2010 Authoritative domain mailbox setup that is not the default

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.