Exchange 2003 - How do I block external email addresses from being able to send an email to an internal email address?

Posted on 2007-07-30
Last Modified: 2009-10-06
I have set up a distribution group for internal use. I dont want any external addresses (hotmail etc) to be able to send emails to the group. It should be used for internal purposes only.
How can this be done?
Question by:gpersand
    LVL 35

    Expert Comment

    there is an option to set delivery restriction in the group properties.
    if you have a group which has all your internal users as members, then you can configure this new group to only accept messages from that group.
    another option would be to remove the smtp address from this group's email properties and assign it a domain.local address
    LVL 18

    Expert Comment

    Assign Primary SMTP email address to this distribution group as or any other email address which does not exist and assign as seconday email address so that only internal mails will flow.
    LVL 28

    Accepted Solution

    Disribution group Properties->Exchange General, mark From Authenticated users only
    LVL 22

    Expert Comment


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