Hardware-based e-mail screening gateways can handle a higher volume of e-mails than their software brethren. These appliances sit between your router and mail servers. Some scan both outbound and inbound mail, others only inbound messages. Filtering rules vary, based on content or behavior, such as determining that a remote host is an open relay. Additionally some of the devices scan for viruses.

Product	Notable features
8e6 Technologies ES2000 Spam Filter	Rules based on user groups. "White lists" of acceptable addresses or domain names.
Escom ASMTP Appliance	Company's ASMTP technology runs as a proxy server daemon on Linux. Handles both SMTP and Extended SMTP messages.
McAfee WebShield e500	Scans SMTP, HTTP, FTP, and POP3. SSL Web-based console for remote management.
Mirapoint Message Director	Outbound message content filtered to enforce corporate policies. Can be managed via HTTPS Web interface, command line interface (CLI), or Java GUI. Integrates with LDAP servers.

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