Although I am looking forward to the new distribution list features in Exchange 2003 I am disappointed that they didn't include the ability for users to subscribe and unsubscribe.via email or via the web. Perhaps the most significant feature is the ability to prevent unauthenticated users from sending email to a distribution list.
"In Exchange 2000 and earlier, you can block specific users from sending to a DL or group, or you can restrict email to a particular list of named users. However, you can't configure a DL or group to accept messages only from authenticated users (and not, for example, from spammers). Exchange 2003's new "Accept messages from authenticated users only" check box gives you exactly that capacity."
This is a great addition when it comes to reducing spam. We actually had this problem at work with one of our list addresses that somehow an external party go a hold of.
5:32:14 AM
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