The new mail-enabled security group is displayed in the group list. Too many users: When there are too many designated users concurrently accessing a shared mailbox (no more than 25 is recommended), they may intermittently fail to connect to this mailbox or have inconsistencies like messages being duplicated in the outbox. By default, messages sent from the shared mailbox aren't saved to the Sent Items folder of the shared mailbox. To make the new address the primary SMTP address for the group, select the Make this the reply address check box. For instructions, see Create a Send connector in Exchange Server to send mail to the internet. 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. This is particularly useful for help and support mailboxes because users can send emails from "Contoso Support" or "Building A Reception Desk." Before you begin In the EAC, navigate to Recipients > Mailboxes. After you've added all of the Mailbox servers that you want to configure, click OK. In the Select server field, select the internet-facing Mailbox server. When a user types the alias on the To: line of an email message, it resolves to the group's display name. If you've configured the group to allow only senders inside your organization to send messages to the group, email sent from a mail contact is rejected, even if they're added to this list. For tenants where the setting is . When you've finished adding members, click OK to return to the New security group page. Organizational unit: This read-only box displays the organizational unit (OU) that contains the security group. Delivery has failed to these recipients or groups: finance@email address. All groups must have at least one owner. In this example, the final value would be https://owa.contoso.com/owa. For example, you may have set the internal URLs to use internal.contoso.com. All senders: This option specifies that the user can accept messages from all senders. It includes external users only if you clear the Require that all senders are authenticated check box. Hide this group from address lists: Select this check box if you don't want users to see this group in the address book. 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. Message delivery restrictions are useful to control who can send messages to users in your organization. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Convert a user mailbox to a shared mailbox (article) Store the host name of your Mailbox server in a variable that will be used in the next step. To increase the size limit to 100 GB, the shared mailbox must be assigned an Exchange Online Plan 2 license. On the mailbox properties page, click Mailbox Features. This enables them to be included in the global address list (GAL) and added to distribution lists. This check box is displayed only when the Automatically update email addresses based on the email address policy applied to this recipient check box isn't selected. It includes external users only if you clear the Check if all senders are authenticated check box. All groups must have at least one owner. Select the Owner approval is required check box if you want the group owners to receive user requests to join the group. Use this section to specify whether owner approval is required for users to join the group. Group moderators: To add group moderators, click Add . The owa (Default web site) window opens. Send email from another person or group (article) Use this section to set options for moderating the group. Enter the domain name you will use with your external Mailbox servers: Enter the . The message delivery restrictions covered in this topic apply to all recipient types. This example displays a list of all security groups in the organization. With the exception of X.400 addresses, Exchange doesn't validate custom addresses for correct formatting. After you've installed Exchange Server 2016 or Exchange 2019 in your organization, you need to configure Exchange for mail flow and client access. No notifications: When you select this option, notifications aren't sent to senders whose messages aren't approved by the group moderators. Under Mailbox settings > Mail flow settings, click the Manage mail flow settings link. If you select this option, members can only be removed by the group owners. In nslookup, look up the record of each FQDN you created. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If you select this check box, messages from external users will be rejected. What happened? In the ecp (Default web site) window that opens, enter the same URL from the previous step, but append the value /ecp instead of /owa (for example, https://owa.contoso.com/ecp). Shared Mailbox not receiving external email . This example creates a security group with an alias fsadmin and the name File Server Managers. The default configuration is "Automatic system-controlled.". I've created the Guest user in Azure AD, Assigned some licenses to the user but am still unable to add the user to the desired shared mailbox. Full Access permission does not grant Send as or Send on behalf permissions. If you select the Owner approval is required check box, the group owner or owners receive an email requesting approval to join the group. OAB (when accessed from the internet) and OAB (when accessed from the Intranet) should show mail.contoso.com. This is the default option. Is there any solutions for that? For more information, see Correcting Shared Mailbox provisioning and sizing. Can I assign a license to the mailbox itself, reset password and provide it to the external user, so he can log into the shared mailbox? Ask for help in the Exchange forums. This topic shows you how to accomplish this. Click Add a group and follow the instructions in the details pane. Having problems? Select a virtual directory and then, in the virtual directory details pane, verify that the External URL field is populated with the correct FQDN and service as shown in the following table: To verify that you've successfully configured your public DNS records, do the following steps: Open a command prompt and run nslookup.exe. In the new EAC, navigate to Recipients > Groups > Mail-enabled security. If you're configuring a mailbox to accept messages only from senders that are members of a specific distribution group, use the AcceptMessagesOnlyFromDLMembers parameter. Manage another person's mail and calendar items (article) Resource mailboxes: Select this check box if you want to include Exchange resource mailboxes. In the Classic EAC, select the group and then click Edit to view the property or feature that you changed. Reject messages from: Use this section to block people from sending messages to this user. Estimated time to complete this task: 50 minutes. If you added an accepted domain in the previous step and you want that domain to be added to every recipient in the organization, you need to update the default email address policy. Run the following command in the Exchange Management Shell. For example, in the properties of the Exchange Web Services (EWS) virtual directory, change the existing value from https://Mailbox01.corp.contoso.com/ews/exchange.asmx to https://internal.contoso.com/ews/exchange.asmx. You can use the new EAC, the classic EAC or Exchange Online PowerShell to place restrictions on whether messages are delivered to individual recipients. Under Group Type, the type is Security group. Using the same URL makes it easier for users to access your Exchange server because they only have to remember one address. External users: You can't give people outside your business (such as people with a Gmail account) access to your shared mailbox. If the recipient scope is set to a specific domain, the Users container in that domain is selected by default. Assign certificates to Exchange Server services. "Off" means auto forward is disabled and "On" means auto forward is enabled. No senders: This option specifies that the mailbox won't reject messages from any senders in the Exchange organization. Under Message Delivery Restrictions, click View details to view and change the following delivery restrictions: All senders: This option specifies that the user can accept messages from all senders. On the mailbox properties page, click Mailbox Features. In the Manage mail flow settings display pane, you will see the Message Delivery Restrictions option. If you're configuring a mailbox to accept messages only from individual senders, you have to use the AcceptMessagesOnlyFrom parameter. You do not need to assign a license to the shared mailbox in order to forward email that's sent to it. On the Mail tab, select Manage mailbox permissions. Encryption: You can't encrypt email sent from a shared mailbox. oc One of my customers reported that someone took over his computer, was moving the mouse, closing windows, etc. Set the toggle to On, and choose whether to send the reply to people inside your organization or outside your organization. Did you try what I suggested? Inbox To: Finance@email address To send this message again,click here. And more easily you could select the option: Required senders to be authenticated to reject outside senders. The account has a password, but it's system-generated (unknown). It includes external users only if you clear the Require that all senders are authenticated check box. We also have a shared mailbox that is in the GAL and on the same domain for email. Click Add to display a list of all recipients in your Exchange organization. Members: Use this section to add members and to specify whether approval is required for people to join or leave the group. Only allow messages from people inside my organization: Select this option to allow only senders in your organization to send messages to the group. Select the name of the user (from whom you plan to give a Send on behalf permission) to open their properties pane. Select the shared mailbox you want to edit, then select Litigation hold > Edit. Group moderators can approve or reject incoming messages. In the list of groups, click the security group that you want to view or change, and then click Edit . For more information, see Best practices for Exchange certificates. If you change the alias, the primary SMTP address for the group will also be changed, and contain the new alias. You can also allow people outside the organization to send messages to this group. Click Add a group and follow the instructions in the details pane. From the attribute, the shared mailbox has been enabled the external receiving. If you want to change the primary email address, your mailbox must have more than one email alias. If the recipient scope is set to a specific OU, that OU is selected by default.