Block emails at a top/global level?

Summary

Way to block emails for entire site

Content

Hi,

Hoping someone might have some suggestions or maybe I am missing something. With the previous Barracuda and new Cisco spam filtering, the settings appear to be at the mailbox level. However, we have almost 200 service mailboxes and adding individual emails to each filter is not efficient.

Is there any way to add emails to filter out globally instead of per mailbox? We do have some business rules setup to flag spam and dump them into a queue, but that still uses resources and creates incidents. I would prefer they simply get filtered out.