Comodo Antispam Gateway (CASG) is cloud based SaaS which prevents junk mail from ever entering your mail server, and its employee inboxes. It is able to filter virus, phishing, malware and harvesting spam attacks.
Being cloud based makes it ideally suited for small to mid-size businesses. It has a centralized, web based management console, so it's easy for administrators to set up; to add users and domains; to configure mail blacklists and whitelists; and to manage quarantined emails.
CASG also provides each employee with a login that allows them to view their quarantined emails and, if required, release them. Because CASG will quarantine messages that were scanned positive for virus attachments it is, in effect, an anti-malware gateway as well