Under Message Delivery Restrictions, click View details to view and change the following delivery restrictions: Accept messages from: Use this section to specify who can send messages to this user. As the admin, you may have company requirements to allow some users access to another user's mailbox. If you add senders to this list, they are the only ones who can send mail to the group. It includes external users only if you clear the Require that all senders are authenticated check box. Only senders in your organization: When you select this option, only users or groups in your organization are notified when a message that they sent to the group isn't approved by a moderator. Back at Servers > Virtual directories, select owa (Default Web Site) on the server that you want to configure, and then click Edit . This is the default option. I had him immediately turn off the computer and get it to me. It includes external users only if you clear the Require that all senders are authenticated check box. For more information, see Correcting Shared Mailbox provisioning and sizing. In Assign owners section, click + Assign owners, select the group owner from the list, and click Next. Set the toggle to Off for any apps you don't want them to use. This is particularly useful for help and support mailboxes because users can send emails from "Contoso Support" or "Building A Reception Desk.". You can also select the group and then click Edit email address from the toolbar to change/edit the Primary email address, add/delete Aliases, and then click Save changes. After this permission is assigned, the delegate has the option to add the group to the From line to indicate that the message was sent by the group. I am having trouble providing access to a shared mailbox for an external user. Exchange admin center > Recipients > Mailboxes > choose the target shared mailbox > Manage mail flow settings > Message delivery restriction > Choose both All senders and Required senders to be authenticated. See Convert a user mailbox to a shared mailbox. If you change the alias, the primary SMTP address for the group will also be changed, and contain the new alias. Consider hiding security groups because they're typically used to assign permissions to group members and not to send email. Not possible. 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. After this permission is assigned, the delegate has the option to add the group to the From line.
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