Exchange Server 2010 allows you to restrict who can send to distribution groups. You can do this in different ways, but it is important to understand the pros and cons of each type of distribution group protection so that you choose the correct one for your situation. Show
Each of these methods can be implemented from any workstation or server you’ve installed the Exchange 2010 management tools on. Preventing External Email to Exchange 2010 Distribution ListsIf you want to prevent any external sender from being able to send email to a distribution group you can simple enable the authentication requirement for that group. This is found in the Properties of the distribution group in the Mail Flow Settings tab under Message Delivery Restrictions.  This option is enabled by default for distribution groups created in Exchange Server 2010, but may have to be manually enabled for groups that existed before your Exchange 2010 migration occurred. This will prevent external, unauthenticated senders from being able to send to the distribution group but may also prevent senders such as network devices or applications from sending to the list if the device or application can’t perform SMTP authentication. Restricting an Exchange 2010 Distribution List to Specific SendersRequiring authentication for an Exchange 2010 distribution group won’t prevent any authenticated senders from sending to it, for example all of the mailbox users in your organization will still be able to send. In some organizations it is desirable to restrict certain distribution groups to only certain senders. This can be performed by configuring the Accept Messages From setting in the Message Delivery Restrictions, and specifying mail-enabled groups who are allowed to send to the list. #550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized ## Restricting distribution groups in this way gets the job done but it is an all or nothing approach. There is no scope to allow some messages from people through to the distribution list. Moderating Exchange Server 2010 Distribution ListsWhen you have a distribution group that you want everyone to be able to send to, but you want to be able to approve or reject messages on a case by case basis, you can use moderation. Moderation allows you to specify one or more mailbox users who can approve/reject emails sent to a distribution group. This is found in the Properties of the distribution group in the Mail Flow Settings tab under Message Moderation. As you can see each of these methods of restricting who can send to distribution groups has its pros and cons. There is no one size fits all approach, but you should be able to find a method that works best for your specific scenario. How do I restrict who can send to a distribution list in Active Directory?You can do it all from Active Directory.. In the EMC, open this primary distribution group and go to the Mail Flow Settings tab.. Open the Message Delivery Restrictions property and add the “Authorized Company Executive Senders” group.. How do I restrict someone from sending an email to a distribution list in Exchange 2016?In the EAC, navigate to Recipients > Mailboxes. On the mailbox properties page, click Mailbox Features. Under Message Delivery Restrictions, click View details to view and change the following delivery restrictions: Accept messages from: Use this section to specify who can send messages to this user.
How do I stop Office 365 users from sending emails outside the organization?Block Users From Sending to External Recipients in Office 365. Name the rule Block Sending to External Domains.. Scroll down a bit and click on the more options link.. Under apply this rule if dropdown, select the recipient.. -> ... . Click Add Condition.. Under the next and statement, select the sender.. ->. How can you prevent people from expanding distribution list?Prevent Distribution Group Expansion. Open the Exchange Admin Center.. Select Recipients in the sidebar.. Click on Groups.. Expand the plus sign and choose Dynamic Distribution Group.. Enter the Display name, Alias, Recipient types who will be members and add rules to filter by attributes.. Click Save when finished.. How do I allow external users to send an email to a distribution list?On the Edit settings page, check the box to Allow people outside of my organization to send email to this distribution group. On the Review and finish adding group, review the information and click Create group. Once your New group (is) created, click Close.
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How to restrict users from sending email to distribution list office 365
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