SOUTHFIELD, MI — DECEMBER 1, 2005 — Computer
Mail Services, Inc. (CMS), an expert in antispam and email security,
has just released BL-Monitor, a free tool to analyze the
effectiveness and efficiency of DNS Blacklist (DNSBL) servers.
Commonly used by antispam filtering products and services, DNSBL
servers are the first line of defense and typically filter
60-70% of spam email.
based on a timing engine simultaneously querying and measuring
the response times of multiple DNSBL servers. Using IP
addresses from local email traffic, it tracks how many are
blacklisted, unlisted or timed out with no response. It then
creates a rank for each server. Since a site running BL-Monitor
is at a unique location on the Internet, relative to the DNSBL
servers tested, the BL-Monitor rank determines a site’s most
is a need to question DNSBL server performance since antispam
filters rely on them heavily. This reliance is based on the
belief that they will perform their function well. Even with
paid subscriptions, there is little assurance given to the
services’ completeness and effectiveness”, said Lih-Tah
Selecting the most
effective DNSBL servers fine-tunes the antispam filter and
improves its ability to efficiently receive inbound email.
Servers that do not blacklist a
site’s inbound spam email IP addresses are of little use.
BL-Monitor identifies the best DNSBL server for the site’s email
traffic, improving filter performance,
saving resources and speeding email delivery.
is awesome. In 5 minutes we used it to discover that our paid
subscription blacklist service is worse than several free ones
available. We did this using our own real-world, actual emails
and addresses. Having a tool to spot-check the health and
reliability of blacklist services is long overdue” said
Greg Bishop, network administrator at Home & Garden Party.
BL-Monitor is available as a free download from the CMS website — http://www.cmsconnect.com.
ABOUT COMPUTER MAIL SERVICES, INC.
Founded in 1982, Sterling Heights, Michigan-based Computer Mail
Services, Inc. (CMS) is a privately held company with expertise
in the development of messaging related products. The company’s
product protects mail servers of thousands of organizations worldwide.
Praetor is a registered trademark and BL‑Monitor is a
trademark of Computer Mail Services, Inc.
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