[Squad] Microsoft Forefront Security for Exchange Server matched a filter

Microsoft Forefront Security for Exchange Server has matched a filter. Filter name: "FILE FILTER= <in>*.zip" File name: "PO772.zip" State: Purged Subject Line: "[Squad] FW: Proforma" Sender: "squad-bounces@mailman.xmission.com" Location: "Microsoft//SLCIHC1 (SMTP Messages\Inbound)"