If you depend on Google Apps and have found expected emails are not being delivered from Group accounts then read the following to resolve.
Google Apps has made changes to Groups settings. If you depend on group emails from outside your domain please login to your Google Apps domain account http://google.com/a/DOMAINNAME
and make the following changes:
- Select "More controls" located on the bottom navigation panel
- Choose "Groups"
- Select Group to be modified
- Choose "Access Settings"
- On the left menu select "Basic Permissions"
- On the right panel choose the drop down under "Post"
- Make sure to add a check mark for "Public"
Save your settings and test.