Update history

Jul 15, 2021	• Published the HTML <PRE> tag versions (long lines should be horizontally scrolled) of the rejection log extracting script in the report page and the rejection log sorting script in the watch tool page additionally to the former plain text versions (long lines are folded).
Jan 29, 2018	• Informed on the top page about the essays on Facebook.
Oct 05, 2017	• Added the notification "Be sure to read before applying" to the index at the top of the report page.
Aug 05, 2015	• Announced my publication "Blocking 97% of abuse e-mail -- Essence of S25R" in the top page (only the Japanese page).
Jul 01, 2015	• Revised the policy of the published black list.
Jun 24, 2015	• Published the black list information.
Feb 28, 2015	• In the page of the rejection log sorting script, described that you can freely alter this script and publish your alteration.
Dec 11, 2014	• In the decscription sample of the /etc/postfix/helo_restrictions file in the report, revised so that an illegal HELO address is rejected even if it is an IP address enclosed by brackets.
Nov 07, 2014	• Revised the rejection log sorting script. (Revised the egrep expression considering a possible change of the log format of Postfix.)
Nov 04, 2014	• Revised the link to s25rtarpitgreylist.
Nov 03, 2014	• Revised the link to XMailCFG.
Oct 27, 2014	• Version up of the rejection log sorting script. (Made it extract all of rejection recode with "4XX".) • Updated A2-6 in the Q&A page according to the above version up.
Oct 06, 2014	• Added No. 13 to the voices of the applyers.
Oct 04, 2014	• Added No. 12 to the voices of the applyers.
Oct 02, 2014	• In the page of the rejection log sorting script, revised the explanation of the "estimated message count" data.
Jun 29, 2010	• Revised A1-6 in the Q&A page.
Jun 27, 2010	• Added Q/A2-6 in the Q&A page.
May 17, 2010	• Restructured the web pages.
Jan 13, 2010	• In the report, revised comment lines in the "rejections" file so that the vi editor doesn't warn.
Dec 26, 2009	• Revised the code of the rejection log sorting script. (The name of the variable "prev_rec" has been changed into "prev_triplet". The action of the script is the same.)
Dec 19, 2009	• In the page of the rejection log sorting script, added the explanation about access mode configuration of the mail log files.
Nov 23, 2009	• Updated the explanation of the Rule 0 in section 3.1 in the report.
Nov 22, 2009	• Published the page of "When your mail is blocked by S25R...".
Nov 15, 2009	• Updated Q/A2-4 in the Q&A page so that it explains how to permit clients authenticated by the SMTP authentication.
Sep 06, 2009	• Published the English translation of the slides for the lecture.
May 18, 2009	• Removed "/\.vh\.plala\.or\.jp$/" out of the white list sample in the report because they have been found to be unrelated with other than the plala.or.jp users.
Mar 22, 2009	• Linked XMailCFG (for Windows).
Mar 15, 2009	• Linked s25rtarpitgreylist of Kimagure PC hiroba (Whimsy PC plaza).
Mar 11, 2009	• Revised the practical white list examples in the report.
Feb 01, 2009	• In the report, revised Rule 1 to avoid trapping IPv6 addresses.
Mar 29, 2008	• Improved the code of the rejection log sorting script. (Made it have a switch to suppress single access records; made it use the -k option of the sort command.)
Dec 02, 2007	• Revised the practical white list examples in the report.
Nov 24, 2007	• In the page of the rejection log sorting script, revised the explanation for finding mistaken rejection against a legitimate mail server.
Sep 17, 2007	• In the report, changed the regular expressions part "adsl" in Rule 6 into "[achrsvx]?dsl". • In the report, deleted the black list item "/^xdsl.+\.dialog\.net\.pl$/" because Rule 6 has been changed.
Aug 10, 2007	• In the report, revised the black list specification of the virtua.com.br domain in the configuration.
Aug 05, 2007	• Improved the code of the rejection log sorting script. (It displays the estimated number of messages.)
Jul 27, 2007	• In the report, changed the configuration so that the former client restriction condition file is divided into a white list file and a rejection condition file.
Jul 25, 2007	• In the report, changed the configuration in order to return a more considerate message to mail relay servers without a reverse name.
Jul 21, 2007	• Corrected the explanation about the generic protection rule 3 in the subsection 3.1 in the report.
Jul 11, 2007	• Removed the practical black list entry example of "zaq.ne.jp" domain in the configuration file (Appendix A.) in the report because abuse mail doesn't come from that domain nowadays.
Jul 09, 2007	• Added practical black list entry examples into the configuration file (Appendix A.) in the report.
Jul 08, 2007	• Added practical white list entry examples and practical black list entry examples into the configuration file (Appendix A.) in the report.
Jun 10, 2007	• Published the Q&A.
Jun 02, 2007	• In the report, changed the rejection messages in the configuration (Appendix A.) to avoid worrying good senders. • In the report, deleted the explanation of an idea which is similar to the domain authentication because I don't think it is useful information.
May 13, 2007	• Corrected words in the report.
May 12, 2007	• Downloading of the white list file has been enabled in the white list information page.
May 08, 2007	• Corrected the rejection log sorting script. ("\" in the regular expression "[^\]]" is unnecessary, although it causes no problems.)
May 03, 2007	• Corrected the regular expressions in the report. ("\" in "[^\.] is unnecessary, although it causes no problems.) • Made mention of bots in the report. • Supplemented the false positive rate in the report. • Supplemented automatic whitelisting technology in the report.
May 02, 2007	• Linked Mr. KAWAMATA's MailUtl3.
Dec 07, 2006	• Linked Mr. SATOH Kiyosi's taRgrey.
Jul 23, 2006	• Published the S25R miscellaneous information blog.
Jul 09, 2006	• Linked Mail Proof Keeper by Cyber System Research Institute. • Linked Mr. SATOH Kiyosi's Starpit.
Feb 06, 2006	• Linked Mr. ITO Masahiko's smtp_wrapper. • Added No. 11 to the voices of the applyers.
Nov 23, 2005	• Added No. 10 to the voices of the applyers.
Oct 08, 2005	• Added No. 9 to the voices of the applyers.
Sep 07, 2005	• Added No. 8 to the voices of the applyers.
Sep 01, 2005	• Linked Mr. SATOH Kiyoshi's Qgrey.
Aug 06, 2005	• Linked Mr. HONJO's Becky! S25R spam filter.
Aug 05, 2005	• Linked my essay "How to discard more than 90% of spam messages automatically using Becky!".
Aug 04, 2005	• Added No. 7 to the voices of the applyers.
Jul 31, 2005	• Published the voices of the applyers (No. 1 to 6).
Jul 27, 2005	• In the subsection 3.3 in the report, supplemented explanation about the search order of client address conditions.
Jul 03, 2005	• In the subsection 3.2 in the report, made mention of rounding up hostnames which include a hexadecimal number.
Jun 28, 2005	• Described the system name in the report. • Added match rates of the check conditions into the statistics description in the report. • Described the HELO command check file sample in the report. • Correcting some explanations and words in the report.
May 26, 2005	• Improved the code of the rejection log sorting script. (It displays the number of messages tried to transfer.)
Apr 18, 2005	• I named this anti-spam system "Selective SMTP Rejection (S25R)". (Mr. SATOH Kiyoshi counseled me to name it.)
Dec. 20, 2004	• Revised the code of the rejection log sorting script. (The name of the variable "latest_month" has been changed into "max_month_num", which describes the accurate meaning. The action of the script is the same.)
Nov 23, 2004	• Linked Mr. HIROSHIMA Naoki's qmail patch.
Oct 06, 2004	• Linked Mr. SATOH Kiyoshi's report (Japanese).
Oct 01, 2004	• Revised the rejection log sorting script.
Sep 20, 2004	• Published the white list information.
Sep 13, 2004	• Published the rejection log sorting script. • Linked the Business Communication magazine report (Japanese).
Jun 26, 2004	• Published the report.