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Functional Accounts Not Receiving Emails (Exchange 2010)

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Situation Inbound Email not received by Functional Accounts in a Distribution List.
Solution Modify the Distribution List Properties in Exchange per the steps below.

Issue

Emails sent inbound to a distribution list are showing delivered within Proofpoint Essentials but not reaching the distribution list.

Resolution

Within Exchange under the Distribution list properties, there is a parameter that needs to be modified so that external emails can be received.

Follow these steps  to make the modification:

  1. Select Properties for the desired distribution list.
  2. Click Mail Flow Settings.
  3. Double-click Message Delivery Restrictions.
  4. Uncheck Require that all senders are authenticated.

Source: https://technet.microsoft.com/en-us/library/bb124405(v=exchg.141).aspx#MDRestrictions

Please contact Microsoft for any further information.