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13Jan/122

How to enable a mailbox or distribution group to receive mail from external senders

In Exchange 2010 you can permit or deny that unauthenticated users (ie senders outside of the Exchange organisation) send mails to a mailbox or distribution group. This setting can be set either in the EMS (PowerShell) or in EMC (console).

The PowerShell command to allow unauthenticated users to send to a mailbox or distribution group is (if you don't want to receive external mails just set the flag to $true):

1
Set-Mailbox -RequireSenderAuthenticationEnabled $false -Identity john.doe@example.com

The same setting can be changed using the EMC. Just open the properties of the mailbox or the distribution group, click on the "Mail Flow Settings" tab and open the properties of "Message Delivery Restrictions". Make sure that the "Require that all senders are authenticated" is checked to whatever you need.
When "Require that all senders are authenticated" is checked then emails from external senders are not accepted.

Mail Flow Settings, Message Delivery Restrictions in Exchange 2010 EMC

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  1. 1) Is a distribution group is also an email address right?
    2) If I need a new address or alias delivered to 2 or more users would this be the best option.
    3) Could i create an alias for one of the users and have exchange forward only the alias to the other user and if yes would this be the best option?

  2. By design Exchange sets all DL not to receive mail form the internet, if you have quite a few Dl’s like in my case this will set RequireSenderAuthenticationEnabled to false.

    Get-DistributionGroup | where {$_.RequireSenderAuthenticationEnabled -eq $True} | Set-DistributionGroup -RequireSenderAuthenticationEnabled $False


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