Enable external senders: Create 2 mail flow rules to allow specific domain user sending mails to the group: One rule for blocking internal users sending mails to the group: Another rule for blocking external users sending mails to the group except for specific domain users: flag Report. OAB (when accessed from the internet) and OAB (when accessed from the Intranet) should show mail.contoso.com. Enter the domain name you will use with your external Mailbox servers: Enter the . Is there any way to set an external user send as or on behalf of an This Receive connector accepts anonymous SMTP connections from external servers. To learn more about litigation hold, see Create a Litigation Hold. Under Choose a group type section, select Mail-enabled security and click Next. The security group is created in the default OU, and anyone can join this group with approval by the group owners. Read and Manage permissions are called Full Access permission when granted in the Exchange admin center. Hello! Select the shared mailbox you want to edit, then select Automatic replies > Edit. Select the shared mailbox you want to edit, then select Email apps > Edit. Select the shared mailbox you want to edit, then select Litigation hold > Edit. About shared mailboxes - Microsoft 365 admin | Microsoft Learn Select the OK button to commit the changes. If you configured your internal and external URLs to be the same, Outlook on the web (when accessed from the internet) and Outlook on the web (when accessed from the Intranet) should both show owa.contoso.com. Repeat the previous steps for each virtual directory you want to change. In the EAC, navigate to Recipients > Mailboxes. If you want to configure a unique Outlook on the web FQDN, do the following steps. For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts in the Exchange admin center. For instructions, see Create accepted domains and Configure Exchange to accept mail for multiple authoritative domains. In the Classic EAC, navigate to Recipients > Groups. It can be any valid email address. By default, only people inside your organization can send messages to this group. This includes the group's primary SMTP addresses and any associated proxy addresses. The articles below might give you the help you need to set up and use this feature: The first step to setting up permissions is deciding which actions you want to allow the other user to take in the given mailbox. For example, you can configure a mailbox to accept or reject messages sent by specific users or to accept messages only from users in your Exchange organization. Require that all senders are authenticated: This option prevents anonymous users from sending messages to the user. For additional management tasks related to recipients, see the following topics: You need to be assigned permissions before you can perform this procedure or procedures. More info about Internet Explorer and Microsoft Edge, Keyboard shortcuts for the Exchange admin center, Create a distribution group naming policy, Override the distribution group naming policy.
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