Ensure that Collaboration Invitations in Microsoft 365 are sent to allowed domains only Using a PowerShell Script
One way to control invitations to B2B collaboration users from specific organizations is by using an allowlist or blocklist. For instance, if you wish to prevent invitations from personal email addresses, you could create a blocklist containing domains such as Gmail.com and Outlook.com. Alternatively, if your business only wants to invite partner organizations such as
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