Create Marketing Shared Mailbox with Read, Send As, and Full Access Roles

This script creates a Marketing shared mailbox and assigns three permission tiers: 10 users with read-only, 10 with “Send As,” and one owner with full access. Great for controlled collaboration environments.

# Create Shared Mailbox
New-Mailbox -Name "Marketing Shared" -Shared -PrimarySmtpAddress "[email protected]"

# Assign Read-Only Access (View Only - use mailbox folder permissions)
$readUsers = @("[email protected]", "[email protected]", "[email protected]")
foreach ($user in $readUsers) {
    Add-MailboxFolderPermission -Identity "[email protected]:\Inbox" -User $user -AccessRights Reviewer
}

# Assign Send As permissions
$sendAsUsers = @("[email protected]", "[email protected]", "[email protected]")
foreach ($user in $sendAsUsers) {
    Add-ADPermission -Identity "Marketing Shared" -User $user -ExtendedRights "Send As"
}

# Assign Full Access to Owner
Add-MailboxPermission -Identity "[email protected]" -User "[email protected]" -AccessRights FullAccess -InheritanceType All

Run this after connecting to Exchange Online. Mailbox folder permissions are used for read-only access.

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