Aladdin's eSafe did well enough and has some features that would be particularly useful during an outbreak, but performance was nothing special. Although eSafe is up to version 4 now, that version is purely appliance-oriented. The last version to support Exchange was 3.5, which the company still sells and supports (for now) despite its focus on moving away from that side of the business towards its Linux-based appliance version.
The Aladdin eSafe Appliance is a hardened, Linux-based device, which can be configured as an email inspection tool (SMTP relay) and, additionally, as a full content-filtering gateway for HTTP/FTP. To obtain the full content-filtering gateway functionality you need to use Check Point Firewall-1 configured with a HTTP/FTP security server as a content vectoring protocol (CVP) client.