This prevents external senders from sending messages to mail-enabled security groups. On the mailbox properties page, click Mailbox Features. I have a shared mailbox that I'd like to stop external emails from reaching. I had him immediately turn off the computer and get it to me. Require that all senders are authenticated: This option prevents anonymous users from sending messages to the user. Without these additional steps, you won't be able to send mail to the internet and external clients (for example, Microsoft Outlook, and Exchange ActiveSync devices) won't be able to connect to your Exchange organization. Of course I have no issues adding "someone@myorganization.com" to the mailbox, but the external user - "someone@externalorganization.com" simply can not be added to the shared mailbox. After you've installed Exchange Server 2016 or Exchange 2019 in your organization, you need to configure Exchange for mail flow and client access. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. No notifications: When you select this option, notifications aren't sent to senders whose messages aren't approved by the group moderators. Note that cross-geo mailbox auditing is not supported. For other recipient types, use the corresponding Set- cmdlet with the same parameters. You can also search for a specific recipient by typing the recipient's name in the search box. After searching through the web interface of Exchange Online, I just can't find where to do that, and searching online isn't returning what I'm looking for. Totally agree with what michev has replied above. Don't notify anyone when a message isn't approved: When you select this option, notifications aren't sent to message senders whose messages aren't approved by the group moderators. The account has a password, but it's system-generated (unknown). More info about Internet Explorer and Microsoft Edge, Keyboard shortcuts in the Exchange admin center, Create a Send connector in Exchange Server to send mail to the internet, Default Receive connectors created during setup, Configure Exchange to accept mail for multiple authoritative domains, Email address and address book permissions, Apply email address policies to recipients, Default settings for Exchange virtual directories, https://Mailbox01.corp.contoso.com/ews/exchange.asmx, https://internal.contoso.com/ews/exchange.asmx, Create an Exchange Server certificate request for a certification authority, Complete a pending Exchange Server certificate request, https://mail.contoso.com/EWS/Exchange.asmx, https://mail.contoso.com/Microsoft-Server-ActiveSync, https://internal.contoso.com/EWS/Exchange.asmx, https://internal.contoso.com/Microsoft-Server-ActiveSync. Select the shared mailbox you want to edit, then select Members > Edit. When you're finished, click Save. Send As Shared Mailbox to Restricted Distribution List - who needs
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allow external senders to shared mailbox