Creating a shared mailbox is an easy operation, but setting up SendAs permissions is a bit tricky.
The following article will describe all the steps for creating a shared mailbox (SM) with the right permissions.

How it’s done ?

  • in Exchange Control Panel (ECP) we must create a new Distribution Group (DG).
    • Display Name: Technical Support;
    • Alias: supportgroup;
    • this DG must be a Security Group;
    • Delivery Management;
    • add the desired members;
    • other minor adjustments.

Now, we must use PowerShell to connect to the Exchange account and to create the SM.

  • Connect to Exchange using PS:

#———————————————————————————
# Author:      Alexandru Dionisie
# Website:     www.tutorialeoffice.ro
# Script Name: Sesiune_Noua.ps1
#———————————————————————————
#
#
# 1.Ask credentials for authentication
$LiveCred = Get-Credential
# 2.Open a new session
$AlexD = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
# 3.Join the session
Import-PSSession $AlexD

  • Create SM using PS, give Full Access and SendAs permissions:

# In ECP or EMC create a new DG .
# The DH must be security enabled or a security group.
#
# Provide the following informations:
# DG display name – Technical Support
# DG alias – supportgroup
#–––––––––––––––––––––––––––
# Author:      Alexandru Dionisie
# Website:     www.tutorialeoffice.ro
# Script Name: Shared_Mailbox.ps1
#–––––––––––––––––––––––––––
#
#
# Create Shared Mailbox
#
# 1. Create mailbox and add alias
# Customer Support – display name for Shared Mailbox
# support – alias (must be unique)
New-Mailbox -Name „Customer Support” -Alias support -Shared
#
# 2. Give Full Access to security group (DG alias – supportgroup) to the shared mailbox
# Customer Support – display name
# supportgroup – DG alias
Add-MailboxPermission „Customer Support” -User supportgroup -AccessRights FullAccess
#
#
# Give SendAs permissions to DG members
#
# Customer Support – display name
# supportgroup – DG alias
Add-RecipientPermission „Customer Support” -Trustee supportgroup -AccessRights SendAs

Now, the permissions are set and users can use the SendAs feature to send E-mail as the SM.

 

Download PS Script:

Shared_Mailbox.ps1

Copy from TechNet: Create Shared Mailbox and assign SendAs in Exchange Online 2010

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