DPM cannot set up an e-mail subscription

In some cases (after a upgrade from RC to RTM for instance) the email subscription to reports is not working. Even when the SMTP Server settings are properly configured (on the SMTP server TAB under options) with a valid e-mail address. 

Test messages work fine and you receive warning and error alert messages. Still you receive the error below.

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DPM cannot set up an e-mail subscription for this report. The information may be missing or incorrect. Click Options in the Actions pane, then click the SMTP Server tab, and provide the correct SMTP server name and e-mail address. ID: 3010
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Solution
You should check if the SMTP server settings is correct set on the report server.

To configure report server e-mail using the Reporting Services Configuration tool

1. Verify that the Report Server Windows service has Send As permissions on the SMTP server.

2. Start the Reporting Services Configuration tool and connect to the report server instance.

3. On the Email Settings page, enter the name of the SMTP server. This value can be an IP address, a UNC name of a computer on your corporate intranet, or a fully qualified domain name.

4. In Sender Address, enter the name an account that has permission to send e-mail from the SMTP server.

5. Click Apply.