What happened? Adding the external user - "[email protected]" to Contacts and Creating a Distribution group also isn't a good alternative. "Off" means auto forward is disabled and "On" means auto forward is enabled. Use this section to view or change the email addresses associated with the group. For information about which parameters correspond to which distribution group properties, see the following articles: Here are some examples of using Exchange Online PowerShell to change security group properties. This is the default option. Set the toggle to On for all of the apps you want members to be able to use to access the shared mailbox. Send on Behalf: This permission also allows a delegate to send messages on behalf of the group. This is particularly useful for help and support mailboxes because users can send emails from "Contoso Support" or "Building A Reception Desk.". Select the shared mailbox you want to edit, then select Email forwarding > Edit. Hello Experts, Use this section to change/edit the following: Under Owners section, click View all and manage owners to add/remove group owners from the drop-down list and then click Save changes. Resource mailboxes: Select this check box if you want to include Exchange resource mailboxes. After this permission is assigned, the delegate has the option to add the group to the From line. 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. For more information about internal and external URLs on virtual directories, see Default settings for Exchange virtual directories Virtual Directory Management. For example, you may want to enable an assistant to send or read email from their manager's mailbox, or one of your user's the ability to send email on behalf of another user. A mail-enabled security group can be used to distribute messages and to grant access permissions to resources in Active Directory. This is because a shared mailbox does not have its own security context (username/password) so it cannot be assigned a key. 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. 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. This example configures the mailbox of Robin Wood to accept messages only from the users Lori Penor, Jeff Phillips, and members of the distribution group Legal Team 1. Choose the + (plus) button to add a new rule. More info about Internet Explorer and Microsoft Edge, Keyboard shortcuts in the Exchange admin center, Create a Send connector in Exchange Server to send mail to the internet, Default Receive connectors created during setup, Configure Exchange to accept mail for multiple authoritative domains, Email address and address book permissions, Apply email address policies to recipients, Default settings for Exchange virtual directories, https://Mailbox01.corp.contoso.com/ews/exchange.asmx, https://internal.contoso.com/ews/exchange.asmx, Create an Exchange Server certificate request for a certification authority, Complete a pending Exchange Server certificate request, https://mail.contoso.com/EWS/Exchange.asmx, https://mail.contoso.com/Microsoft-Server-ActiveSync, https://internal.contoso.com/EWS/Exchange.asmx, https://internal.contoso.com/Microsoft-Server-ActiveSync. You can add owners by clicking Add . In the When a new message arrives: section change the default From: popup menu to Account > Is > and choose the shared mailbox account name. The dialog box displays all OUs in the forest that are within the specified scope. This example displays a list of all security groups in the organization. We also have a shared mailbox that is in the GAL and on the same domain for email. When you've finished adding members, click OK to return to the New security group page. Verify that the value returned matches the FQDN of the Mailbox server. We recommend that you configure a user principal name (UPN) that matches the primary email address of each user. If you select this check box, messages from external users will be rejected. Use the Get-DistributionGroup and Set-DistributionGroup cmdlets to view and change properties for security groups. On the group's properties page, click one of the following sections to view or change properties. 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. Under Mailbox settings > Mail flow settings, click the Manage mail flow settings link. If you don't provide a UPN that matches the email address of a user, the user will be required to manually provide their domain\username or UPN in addition to their email address. It also must be unique in the forest. Read email in another user's mailbox In the admin center, go to the Users > Active users page. Back at Servers > Virtual directories, select owa (Default Web Site) on the server that you want to configure, and then click Edit . View Best Answer in replies below 2 Replies lou1sl jalapeno Dec 1st, 2021 at 9:44 PM check Best Answer We can use the Exchange Online Powershell cmdlet Set-UnifiedGroup to set the people outside the organization to send mail to a specific group. Select Add permissions, then choose the name of the user or users that you want to allow to read email from this mailbox. 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. 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. The following steps show you how to configure an SSL certificate from a third-party certificate authority (CA): Create an Exchange Server certificate request for a certification authority. Here is what I've done: This example configures the mailbox of Robin Wood to accept messages only from the users Lori Penor, Jeff Phillips, and members of the distribution group Legal Team 1. With the exception of X.400 addresses, Exchange doesn't validate custom addresses for correct formatting. Verify that the value that's returned for each FQDN is correct. You can use the EAC or the Exchange Management Shell to place restrictions on whether messages are delivered to individual recipients. The steps in this topic assume a basic Exchange deployment with a single Active Directory site and a single simple mail transport protocol (SMTP) namespace. If you want to override your organization's group naming policy, see Override the distribution group naming policy. Use this section to assign permissions to a user (called a delegate) to allow them to send messages as the group or send messages on behalf of the group. All senders: This option specifies that the user can accept messages from all senders. For more information, see Default settings for Exchange virtual directories. Automatically update email addresses based on the email address policy applied to this recipient: Select this check box to have the recipient's email addresses automatically updated based on changes made to email address policies in your organization. Block messages from: Use this section to block people from sending messages to this user. Inbox To: Finance@email address To send this message again,click here. 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).