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<div class="left_inner_box_heading"><h1>[MD1] Blacklisting with Stalker Internet Mail Server 1.6</h1></div>
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<p>FOR IMMEDIATE RELEASE</p>
<p>Stalker Software Announces Stalker Internet Mail Server 1.6</p>
<p>Key features: New Blacklisting (RBL) implementation, support for mobile<br />
users, still FREE</p>
<p>MILL VALLEY, CA - April 22th, 1998 - Since the first free public release of<br />
Stalker's Internet Mail Server, it has been consistently upgraded with new<br />
performance enhancements. The most recent public version to be released<br />
1.6, offers the latest technologies for mail servers including anti-spam<br />
features and better administrative additions.</p>
<p>IP Blacklisting has been proven to be the most efficient way to cut<br />
unsolicited E-mail ("spam") messages: mail servers with IP blacklisting<br />
implemented rejects all messages that come from known offenders. However,<br />
spammers may change their providers and IP addresses, and new spammers<br />
appear every week. This makes the job of keeping the Black List current an<br />
everyday duty for mail server administrators.</p>
<p>The DNS-based blacklisting is a new emerging technology that automates this<br />
task. A regular DNS server located anywhere on the Net can be used to keep<br />
the IP addresses of all known spammers. The anti-spam warriors inform the<br />
administrator of the black-listing server about unsolicited E-mail their<br />
users have received, so that the server has an up-to-date list of known<br />
offenders.</p>
<p>With the 1.6 version of SIMS, the name of a black-listing server can be<br />
entered in the SMTP module settings. When SIMS receives mail from a remote<br />
host, it checks not only its own black list, but also consults the black-<br />
listing server, too. If the sending host is included in the blacklisting<br />
DNS server tables, messages from that host are not accepted. The entire<br />
process is automatic and allows all mail server administrators to<br />
centralize and to distribute their knowledge about offending sites. Since<br />
the blacklisting servers are implemented using the existing DNS technology<br />
and software, several servers are already available on the Net, and they<br />
can be used with any SIMS 1.6 mail server.</p>
<p>One of the first anti-spam features implemented in SIMS was protection from<br />
unauthorized mail relaying. SIMS could relay a message to any Internet site<br />
only if it was sent from a known (usually - LAN) IP address. This feature<br />
did not allow spammers to abuse a SIMS server, but it also created problems<br />
for mobile users that connected to the Internet via various providers, and<br />
thus used various IP addresses. These mobile clients could not use SIMS as<br />
their "SMTP server". With the version 1.6 this problem is addressed in two<br />
ways.</p>
<p>First, the so called "XTND XMIT" extension is implemented in the POP<br />
module. It allows remote users to submit messages via the POP, not SMTP<br />
protocol, and the POP3 protocol authenticated users using passwords, not IP<br />
addresses. Eudora and some other mailers support this POP protocol<br />
extension.</p>
<p>Second, the POP module records the client IP address when it authenticates<br />
a user. During the next minute, messages from that IP address are processed<br />
as messages from the known (LAN) clients. When remote users check their<br />
mail on the SIMS server (this results in user authentication), their IP<br />
addresses are recorded. Then they submit messages to the server via the<br />
regular SMTP protocol. Since the messages come from the authenticated<br />
addresses, they are marked as such and can be relayed anywhere.</p>
<p>Along with the new Anti-spam features, SIMS has been updated with several<br />
enhancements for Administrators, thus allowing for easier monitoring of the<br />
server. The SIMS logs now receives a Failure (Level-1) record when the SMTP<br />
module rejects a return-path or a recipient address, and a when the POP or<br />
PWD module rejects a user name/password: this feature allows administrators<br />
to detect when their systems are under attack.</p>
<p>PRICING and AVAILABILITY: Stalker Internet Mail Server is available free of<br />
charge. The software can be downloaded from:<br />
(<a href="http://www.stalker.com/SIMS/" title="http://www.stalker.com/SIMS/">http://www.stalker.com/SIMS/</a>), (<a href="ftp://ftp.stalker.com/" title="ftp://ftp.stalker.com/">ftp://ftp.stalker.com/</a>) and Stalker mirror<br />
sites overseas.</p>
<p>DOCUMENTATION: the entire SIMS System Guide can be used via the Internet at<br />
( <a href="http://www.stalker.com/SIMS/" title="http://www.stalker.com/SIMS/">http://www.stalker.com/SIMS/</a>), and it can be downloaded for local use<br />
from the same SIMS site.</p>
<p>SUPPORT: Stalker Software has an active list (<a href="mailto:sims@stalker.com">sims@stalker.com</a>) mailing to<br />
discuss the SIMS issues. With 50+ messages per day and several hundred<br />
subscribers, this list provides immediate technical support assistance both<br />
from the Stalker support staff and experienced SIMS administrators.<br />
Subscription requests should be sent to (<a href="mailto:sims-on@stalker.com">sims-on@stalker.com</a>), and the<br />
digest- mode subscription can be requested at (<a href="mailto:sims-digest@stalker.com">sims-digest@stalker.com</a>)</p>
<p>All product names are trademarks or registered trademarks of their<br />
respective manufacturers.</p>
<p>Stalker Software, Inc. develops and distributes networking and<br />
communication software for the MacOS. The company was founded in Europe in<br />
1991 and opened its U.S. offices in 1993 at 655 Redwood Highway, suite 275,<br />
Mill Valley, Calif. 94941. For more information about Stalker Software and<br />
its products, please contact Ali Liptrot, director of sales and marketing,<br />
at (800) 262-4722 or (415) 383-7164, fax to (415) 383-7461, or E-mail at<br />
(<a href="mailto:ali@stalker.com">ali@stalker.com</a>). Visit the Stalker Software web site at<br />
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