Gmail – Make Gmail/Google Apps not mark wrong emails as spam

We needed to setup a distribution list where there were many aliases but they all were delivered to the same users. The best approach we found was creating a fake user account, setting up aliases on that account, forwarding the email to a real group, and using the group membership function to setup the distribution list. Works reasonably well, but having aliases for a group would be better.

Looks like you can also nest groups within groups. There is at least one help topic that recommends this approach. The above mentioned approach does give a few other features however, such as vacation responders and the ability to backup mailing list email using POP/IMAP.

Responding to :

The client uses Outlook, so they do not report Spam to Gmail

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Gmail's spam filters work the same for a person using the web interface or a client like Outlook. I mean, the spam filters will tag a message as spam / non-spam before sorting it into the appropriate folder.

From this page, moving a message to the [Gmail]/Spam folder performs the same action as clicking the REPORT SPAM button - so there is in fact a method to report spam via an email client.