Use same alias for Shared Mailbox in multiple domain

May 23, 2018 | by iaur | posted as Administration, Exchange Online

You can access Exchange Admin Center> Left Pane> Recipients > Shared\Mailbox > click more option to make the alias field available.

Alias is the key parameter of a shared mailbox to make it unique in the backend specially if you have multiple domain.

To explain further, here is an example. I have two domains(domain A and domain B) and want to create a shared mailbox for both respective IT teams hence 

it@domainA.com and it@domainB.com. By design the address name “it” will be unique address in the entire tenancy hence you need to mask it with an alias for

the system to know the two “it” mailbox is unique from their respective domain and so that the creation will push through.

In conclusion, the IT mailbox for my Domain A will have an alias of “ita” and Domain B will have an alias of “itb”.(See screenshot for more info)

New Shared Mailbox - Google Chrome 
Secure https://outlookoffice365.com/ecp/LJsersGroups/NewSharedMailbo.. 
new shared mailbox 
Shared mailboxes allow a group Of users to view and send 
email from a common mailbox and share a common 
calendar. Learn more 
*Display name, 
IT @ DomainA 
•Email address: 
Users 
The following users have permission to view and send mail 
from this shared mailbox. 
DISPLAY NAME 
Alias: 
itA 
The user's alias is the 
portion of the email 
address on the left side of 
the @ symbol. It must be 
unique in your 
organization. 
Cancel
New Shared Mailbox - Google Chrome 
Secure https://outlookoffice365.com/ecp/UsersGroups/NewSharedMailbo... 
new shared mailbox 
Shared mailboxes allow a group Of users to view and send 
email from a common mailbox and share a common 
calendar. Learn more 
*Display name: 
IT @ Domaina 
•Email address: 
Users 
The following users have permission to view and send mail 
from this shared mailbox. 
DISPLAY NAME 
Alias: 
The user's alias is the 
portion of the email 
address on the left side of 
the @ symbol. It must be 
unique in your 
organization. 
Cancel

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