Set the toggle to On for all of the apps you want members to be able to use to access the shared mailbox. This includes both senders in your Exchange organization and external senders. It includes external users only if you clear the Check if all senders are authenticated check box. No notifications: When you select this option, notifications aren't sent to senders whose messages aren't approved by the group moderators. Use this section to assign group owners. We have a hybrid system with no exchange server, only use o365 and AD schema extended attributes on onprem DC. The rebound comes from postmaster@<domain>.onmicrosoft.com. Reject messages from: Use this section to block people from sending messages to this user. Organizational unit: You can select an organizational unit (OU) other than the default (which is the recipient scope). Manage dynamic distribution group in Exchange Online If you configured the internal URLs to be internal.contoso.com, Outlook on the web (when accessed from the internet) should show owa.contoso.com and Outlook on the web (when accessed from the Intranet) should show internal.contoso.com. On the mailbox properties page, click Mailbox Features. Clients want to share files via OneDrive email so Bob and Anne can book in the jobs, but they specify to share with sales@whatever - a shared mailbox which Bob and Anne both have full access to as well as "send as" permissions. Replace the example values with the server names, FQDNs, and IP addresses for your organization. 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. After you've installed Exchange Server 2016 or Exchange 2019 in your organization, you need to configure Exchange for mail flow and client access. By default, only people inside your organization can send messages to this group. The display name is required and should be user-friendly so people recognize what it is. The shared mailbox has more than 50 GB of storage in use. Hello! If you're setting up a mailbox to accept messages only from senders that are members of a specific distribution group, use the AcceptMessagesOnlyFromDLMembers parameter. To verify that you've successfully configured message delivery restrictions for a user mailbox, do one the following: In the EAC, navigate to Recipients > Mailboxes. In the list of groups, click the mail-enabled security group that you want to view or change. You can also allow people outside the organization to send messages to this group. If you select the Owner approval is required check box, the group owner or owners receive an email requesting approval to join the group. Hiding a shared mailbox from address list will make it impossible for new shared mailbox members to add the hidden mailbox to their Outlook profile until the shared mailbox is again shown in the address list. How to allow external users to send emails to a list in Office 365? As an alternative I have created a Microsoft 365 Group and added the external user there. The permissions can be set up only within the current organization tenant. There's no way to only send to people outside your organization but not to people inside your organization. Open up Active Directory Users & Computers, select properties of the affected group, and click the "Office 365" tab. Select the recipients you want, add them to the list, and then click OK. You can also search for a specific recipient by typing the recipient's name in the search box and then clicking Search . Under Members, you can add members by clicking Add .
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