My company is using Google Apps for its email service. We use Google groups for business as shared inboxes for general company enquiries and correspondence, e.g. info@mycompany.com, to which outside senders are able to post to the group and the group members can read through the messages.The standard Gmail has very good spam blocking and virtually no spam gets through to our inboxes, but unfortunately the same cannot be said for the group. We have started receiving a lot of spam (see below). The only spam features visible in the group seem to be ban author which is not an ideal solution given that each one comes from a different email address.Is there anything we can do better manage the spam we receive? Given these capabilities are integrated into Gmail, it seems plausible they should be applied to group as well. 
Blocking spam in Google Groups for Business
gmail;google apps;google groups