I'm trying to find or develop a way to quarantine mail from specific senders for specific domains. Is there a well-defined way to do this? It appears the amavisd.conf doesn't provide the ability to specify different policies based on domains.
Since you already use Amavis::Custom, you can amend the new-hook:
# *custom hook: new() - may inspect info, may load policy banks
So, iterate $msginfo->per_recip_data, extract the domain from each recip_addr, extract the domain from $msginfo->sender and then make a decision which policy bank you wish to load via Amavis::load_policy_bank()
