To learn more about the different recipient types, see Recipients in Exchange Online. The public DNS records should point to the external IP address or FQDN of your internet-facing Mailbox server and use the externally accessible FQDNs that you've configured on your Mailbox server. This includes external users that are outside of your Exchange organization. Under Set up the basics section, enter the details and click Next. In the list of groups, click the mail-enabled security group that you want to view or change. We have a distro list that is set to only allow internal senders. I tried to create a distribution group named "All users" and allow only the group "DG01" to send messages to it: And there is a shared mailbox "share1" in the member list of the group "DG01": After I assigned the Send As permission of the shared mailbox to my mailbox, I tried to "send as" a message to the restricted group "All user": If sharedmailbox@<domain>.com is used by an external sender, they get an NDR saying that the sharedmailbox/server could not be found at <domain>.mail.onmicrosoft.com. In the Classic EAC, navigate to Recipients > Mailboxes. You must make sure that the custom address you specify complies with the format requirements for that address type. In the Exchange server properties window that opens, select the Outlook Anywhere tab, configure the following settings: Specify the external host name: Enter the externally accessible FQDN that your external clients will use to connect to their mailboxes (for example, mail.contoso.com). To add members to the group, click Add . Select the shared mailbox you want to edit, then select Litigation hold > Edit. Visit the forums at Exchange Online or Exchange Online Protection. To configure a mail-enabled security group to accept messages from all senders, you must modify the message delivery restriction settings for that group. Those shared mailboxes are supposed to receive e-mails from external senders. In the list of user mailboxes, click the mailbox that you want to set up message delivery restrictions for, and then click Edit . Enter the domain name you will use with your external Mailbox servers: Enter the external domain that you want to apply (for example, mail.contoso.com). Advantages of using Exchange Online PowerShell are the ability to change the properties that aren't available in the EAC and to change properties for multiple security groups. Require moderator approval for messages sent to this group: This check box isn't selected by default. This is the default option. In Assign owners section, click + Assign owners, select the group owner from the list, and click Next. Set the toggle to On for all of the apps you want members to be able to use to access the shared mailbox.

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