The following services block spam before it reaches your mail servers, saving your bandwidth for bona fide messages. Filtering options, available statistics, and Web interfaces vary. Some services let you choose whether to block spam or send it to an administrator. Most of these services don't require that you install dedicated hardware or software at your site. Some services also offer virus protection.

Product	Notable features
BrightMail Anti-Spam	Samples spam sent to over 100 million e-mail addresses. Staff push spam-blocking rules to dedicated servers at your site. Web-based interface. Anti-virus available.
Mail-Filters.com	Message backup. No hardware or software installed at your site.
MessageLabs SkyScan AS	Spam can be blocked or sent to a system administrator. Via the Web-based management interface you can select which IP addresses, domain names, and specific e-mail addresses to block.
Postini Junk Email Assistant	SMTP statistics. Systemwide alerts. Centralized management of applications. No hardware or software installed at your site.
Singlefin Email Gateway Services	Automatic filtering to separate inbox. Web-based control panel. Message backup. Virus protection via Sophos and Trend Micro. No hardware or software required at your site.
Syntegra eMail Sentinel	Works with any SMTP messaging server. Sendmail-based SMTP router. Centralized server-based tools that protect against Internet spam attacks. Web administration tools.
United Messaging Message Control	Automatic filters for Reverse DNS, MAPS RBS, MAPS DUL, and MAPS RSS. Virus scanning.

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