How to fix: "Your message wasn’t delivered because of security policies in Exchange 2007 and Exchange 2010"

This articles outlines the steps needed to fix the Your message wasn’t delivered because of security policies in Exchange 2007 and Exchange 2010 error.

When you’re trying to send an email to a distribution group in Microsoft Exchange 2007 or Microsoft Exchange 2010, the following error may be returned:

Delivery has failed to these recipients or distribution lists
Your message wasn’t delivered because of security policies in Exchange 2007. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

This error occurs when external users (i.e. people outside your organisation) attempt to send email to an internal distribution group. By default, Exchange only allows authenticated users (i.e. logged in domain users) to send email to a distribution group.

To allow external users (i.e. people outside your organisation) to send email to your distribution group follow these steps:

- Open the Exchange Management Console

- Expand Recipient Configuration

- Click Distribution Group

- Double-click the distribution group that you want to allow external users to send to.

- Click the Mail Flow Settings Tab

- Double-click Message Delivery Restrictions

- Untick “Require that all senders are authenticated“ (See pic below)



- Click OK

- You can now close Exchange Management Console

This will resolve the Your message wasn’t delivered because of security policies in Exchange 2007 and Exchange 2010 error.

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