VA Linux Releases SMTPGuard, as Open Source

Shuji Sado writes “VA Linux Releases ‘SMTPGuard’, a Brand-new Anti-SPAM Solution,
as an Open Source Software [VA Japan is related to NewsForge].

— Opening Up the Source Code Of Highly-acclaimed Anti-SPAM Software,
Which Has Been Deployed at Japanese ISPs with Over 100 Million Accounts —

Tokyo, JAPAN – November 8, 2005 —
VA Linux Systems Japan K.K. (VA Linux), a leading provider of Linux solutions
for the telecommunications and enterprise systems markets, today announced the
release of ‘SMTPGuard’, an Open Source, anti-SPAM software for MTAs, which can
eliminate unsolicited e-mails (SPAM) flexibly. SMTPGuard is a part of ‘VA FMS’
(VA FlexMessaging Solution), VA Linux’s total messaging solution. VA FMS is
based on Open Source Software and known for its high reliability, high
availability, high performance, and extensibility, which enable VA FMS to
support large networks with over 100 million accounts.

SMTPGuard is a new anti-SPAM software running on SMTP servers. SMTPGuard
collects information acquired in SMTP sessions such as IP addresses,
MAIL FROMs, RCPT TOs or their patterns and the number of times
of appearance. SMTPGuard then
calculates weight points based on user- designated set of rules, and tells MTAs
to perform appropriate actions such as denying mails, delaying answering
sessions, sending warning e- mails to the administrators and so on. With
SMTPGuard, even if SMTP servers are drowned in a flood of SPAM mails even
including virus mails, the administrators can control the incoming stream by
limiting acceptance of mails sent by specific IP addresses or senders so that
the mail system can operate stably. Weight points and actions in response to
them can be set by users and highly customizable.

SMTPGuard has already been used on mail systems for Japanese ISPs with over 100
million accounts, and highly acclaimed by their users as an outstanding anti-
SPAM solution. SMTPGuard would be suitable for any enterprises or network
service providers which run large mail servers.

SMTPGuard is released on the FlexGuard Project page at
( The source code, binary package
and documents can be obtained from that page. Also, VA Linux has already done
ITP (Intent To Package) and committed the SMTPGuard package to
Debian GNU/Linux,
thus Debianized SMTPGuard package will be available from the official Debian
archive within weeks.

VA Linux expects many feedbacks by releasing its source code to the public,
which make SMTPGuard more stable and reliable.

“The release of SMTPGuard as an OSS this time is basically a sequel to the
release of FlexPOP in June, 2005.” said Tetsuya Ueda, President and CEO of VA
Linux in Tokyo. “However, VA Linux has been opening up not only them but also
other components which compose VA FMS. VA Linux’s technological excellence and
the firm roots on Open Source will bring more reliable Open Source-based
solution to our customers.”

* FlexGuard Project:

About VA FMS

VA FMS is an Open Source-based total messaging solution designed to provide
flexible mail solution to a multitude of organizations, all the way from medium-
sized (such as with tens of thousands accounts) up to large-scale (such as with
over 100 million accounts) network service providers. VA FMS is built on a fine
array of Open Source Software combinations (MTA, POP, IMAP, anti-SPAM measures
and so on) and all of them are skillfully improved and tuned by VA Linux to
supplement missing features and more robustness.

VA FMS consists of ‘FlexMail’, a Postfix-based high-performance mail transfer
agent improved by VA Linux, ‘FlexPOP’, the original POP server which supports
Maildir style, ‘FlexIMAP’, a Courier-IMAP based IMAP server especially
tuned for large-scale mail system, and the original SPAM
filtering solution for MTA called
‘FlexGuard’, which is capable of excluding SPAM mails effectively. These
components may fully utilize VA Linux’s other solutions such as the load-
balancing solution ‘VA Balance’, the LDAP directory server solution ‘VA
Directory’, and the core OS ‘VA Core’. Since VA Linux provides the whole mail
system from OS to application, customers can expect rich, source code level
(including Linux kernel) technical support by VA Linux’s able experts.

Also, VA FMS adopts a modular architecture, which means each function for mail
systems (MTA / IMAP / POP / LDAP / NFS and so on) are divided into independent
modules and distributed. This architecture promises configuration
flexibility —
for example, just adding servers or disks is well enough to improve the system
performance as a whole. This level of modularity makes it easier to cope with
large-scale / high-traffic requests from our demanding customers. Also, all
components which comprise of VA FMS are designed to make full use of completely
replicated servers on which it works, therefore high-reliability and stability
are guaranteed. Besides, various code improvements and additions
for the carrier / enterprise grade help to accomplish robustness
and high- performance.

* VA FMS product page:

About VA Linux Systems Japan K.K.

Founded in September 2000, VA Linux Systems Japan K.K. (VA Linux), which has
based its operations on the development of Linux and Open Source, has
become one
of the premier providers of Linux kernel, technological, and software solutions
in the Japanese domestic market. From March 2004 onward, VA Linux has been the
recipient of funding from NTT Comware and NTT Data. VA Linux is currently
at the forefront of implementing Linux solutions for
telecommunication and enterprise system markets.


Takako Iizuka
Public Relations
VA Linux Systems Japan K.K.
phone: +81-3-3293-5151
fax: +81-3-3293-5152
Email: mktg at”