Scheduled Salesforce report not getting to user

Salesforce.com could not email the report to any of the specified recipients. Check that recipients are specified and that they have the appropriate permissions to view the report.

If you get this ^error:

Make sure you also check:
Setup > Customize > Reports & Dashboards > Email Notifications > Allow Reports and Dashboards to Be Sent to Portal Users

Posting this here since it took me a long time to find this checkbox.