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  • <a name="200302160"> Chris Hardie has updated his qmail <a href="http://www.chrishardie.com/tech/qmail/qmail-antispam.html">anti-spam howto</a>.</a>
  • <a name="20000810"> Dan's <a href="rbl/">rblsmtpd</a> blocks spam using the RBL</a> and other DNS-based lists. Because of the size of the RSS zone, they have removed the necessary TXT records that rblsmtpd relies on. Alan Curry has a patch to <a href="ucspi-rss.diff">rblsmtpd to make it work with A records</a>. <img src="new.gif" alt="new" width=31 height=12 date="200403270"> <a name="200403270">David Jonas has a patch to rblsmtpd to let you <a href="http://www.linuxpenguins.com/forum/viewtopic.php?p=6">ignore certain A record</a> responses from the bl lookup.</a>
  • <a name="200103301"></a><a href="http://www.qmail.org/cgi-bin/m/nelson-qa@aqmail.org">Russell Nelson</a> has a pair of programs to help <a href="spam-filter">keep spam out of your mailbox</a>.
  • <a name="200109252">Jason R. Mastaler has improved <a href="http://tmda.sourceforge.net/">TMDA</a>, an anti-spam system.</a>
  • Lionel Widdifield</a> wrote an anti-spam patch. Someone made some improvements to Lionel's patch, which Lindsay Haisley has <a href="http://www.fmp.com/downloads/qmail-antispam4.tar.gz">ported to qmail 1.03</a>. <a name="200112280">
  • <img src="updated.gif" alt="updated" width=52 height=12 date="200403290"><a name="200403290"><a href="http://www.unixpimps.org/software/qregex/">qregex</a> provides full regexp matching on envelope addresses.</a>With REs (Regular Expresions) it becomes quite easy to filter out email addresses that contain invalid characters or simply aren't a real address. Andrew St. Jean has <a href="http://www.arda.homeunix.net/store/qmail/">added</a> case insensitive pattern matching and logging when a match is found.
  • <a href="http://www.qmail.org/cgi-bin/m/cjohnsona@apalomine.net">Chris Johnson</a> has a patch to implement <a href="http://www.palomine.net/qmail/tarpit.html">tarpitting</a> in qmail-smtpd. If you don't know what tarpitting is, it's the practice of inserting a small sleep in an SMTP session for each RCPT TO after some set number of RCPT TOs. The idea is to thwart spammers who would hand your SMTP server a single message with a long list of RCPT TOs.
  • <img src="updated.gif" alt="updated" width=52 height=12 date="200405280"><a name="200405280">Nagy Balazs wrote a patch to ensure that the domain name on the <a href="http://js.hu/package/qmail/index.html">envelope sender is a valid DNS name</a></a>. This is not terribly effective against spammers, but I list it here because some people want it.
  • <a name="20001108"> Jon Rust wrote <a href="http://jon.rusts.net/qrblcheck.c">qrblcheck</a></a>, which reads a message on stdin, grabs the IP address from the Received lines and checks it against five different DNS-based spamlists.
  • <a name="20001230"> Jay Soffian has a qmail-queue replacement to <a href="qqrbl">filter against DNS spamlists.</a></a>. It uses Bruce Guenter's <a href="#qmailqueue">QMAILQUEUE</a> patch. Matching email is not rejected, but instead an X-RBL: header is added, for filtering at the delivery layer.
  • <a name="200111130">O'Shaughnessy Evans has a set of shell scripts that comprise a spam-filtering system called "<a href="http://isle.wumpus.org/cgi-bin/pikie?SpamRule">spamrule</a>".</a>
  • <a name="200111131">Ask Bjørn Hansen wrote <a href="http://develooper.com/code/qpsmtpd/">qpsmtpd</a>, a smtp server with filtering tools</a>. It's written in perl. <a name="200305130">
  • <a name="200312200">Erwin Hoffman's <a href="http://www.fehcom.de/qmail/spamcontrol.html">SPAMCONTROL</a> combines many spam control features</a>. Includes SMTP Auth with CRAM-MD5 support.
  • <a name="200202060">EnderUNIX Team wrote <a href="http://www.enderunix.org/spamguard">spamGuard</a></a>, which scans your log files for "too much" email from a particular user, and adds them to badmailfrom.
  • <a name="200202090">Russell Nelson has a patch to <a href="qmail-smtpd-relay-reject">reject relay probes</a> generated by so-called anti-spammers.</a> These relay probes have '!', '%' and '@' in the local (username) part of the address.
  • <a name="200212310">Dale Woolridge, James Law, and Moto Kawasaki's <a href="http://spamthrottle.qmail.ca/">spam throttle</a></a> patch provides a method to rate limit/stutter spam (message throughput) via a highly parameterized control interface. As of release 2.01, tcpserver is no longer a strict requirement.
  • <a name="200203250">James Grinter has instructions on <a href="http://www.gbnet.net/~jrg/qmail/ifspamh">using SpamAssassin</a></a>. It's a script that runs from a .qmail file.
  • <a name="200203310">Chris Kennedy has written the <a href="http://sourceforge.net/projects/blackholespam/">BlackHole</a> spam/virus filter</a>.
  • <a name="200204110">Noel Mistula wrote <a href="http://ngm.id.au/checkhab">checkhab</a></a>, which checks for HTML, attachments, and binaries in email, and blocks them.
  • <a name="200208051">Gerrit Pape wrote <a href="http://smarden.org/qconfirm/">qconfirm</a></a>, a delivery confirmation process for a mail address. <a name="200208052"></a>
  • <a name="200312030">Chris Johnson wrote <a href="http://www.palomine.net/qdated/">qdated</a></a> to create and verify timestamped e-mail addresses. These addresses expire after a user-configurable period of time; any mail sent to an expired address will bounce.
  • <a name="200209240">Roger Merchberger has some techniques to deal with <a href="http://www.30below.com/~zmerch/qmail/">double-bouncing email</a></a>.
  • <a name="200301290"><a href="http://q-sorter.sourceforge.net">q-sorter</a> sorts your email into separate inboxes.</a>
  • <a name="200301291"><a href="http://search.cpan.org/author/JRAFTERY/">Net::QMTP</a> - This perl module implements an object oriented interface to a Quick Mail Transfer Protocol (QMTP) client</a> which enables a perl program to send email by QMTP.
  • <a name="200302180">Georg Lehner tells how to configure <a href="http://www.magma.com.ni/~jorge/spamassassin.html">Qmail with Spamassassin</a></a>.
  • <a name="200309030">Jeffrey Clement wrote a time-limited email-address program called <a href="http://jclement.ca/software/datedmail.py/">datedmail</a></a>. <a name="200310150" />
  • <img src="updated.gif" alt="updated" width=52 height=12 date="200409130"><a name="200409130">Luca Morettoni wrote <a href="http://morettoni.net/qmail-rblchk.en.html">qmail-rblchk</a></a>, which checks the IP address in the Received: line of an email message on stdin against named DNSBLs.
  • <img src="new.gif" alt="new" width=31 height=12 date="200401020"><a name="200401020">Jean-Eudes ONFRAY wrote a <a href="rhsbl.patch">rhsbl patch</a> for tcpserver</a>. This lets you block or whitelist email based on the reverse-DNS hostname rather than IP.
  • <img src="new.gif" alt="new" width=31 height=12 date="200401090"><a name="200401090">Philip Gladstone wrote a delivery-time <a href="http://pond.gladstonefamily.net/do-spf.pl">SPF checker</a>.</a> More on <a href="http://spf.pobox.com">SPF</a>.
  • <img src="new.gif" alt="new" width=31 height=12 date="200402040"><a name="200402040">Christophe Saout wrote a <a href="http://www.saout.de/misc/spf/">SPF checker</a></a> that runs inside qmail-smtpd and is written using the native dns and string functions that come with qmail.
  • <img src="new.gif" alt="new" width=31 height=12 date="200406010"><a name="200406010">Markus Stumpf has a patch for qmail-smtpd that <a href="http://www.lamer.de/maex/creative/software/qmail/105-sober-g/">rejects W32/Sober-G</a> at the SMTP level.</a>
  • <img src="new.gif" alt="new" width=31 height=12 date="200406010"><a name="200406010">Jay Soffian has modifies qmail-smtpd to <a href="http://www.soffian.org/downloads/qmail/qmail-smtpd-doc.html">fork/exec $RCPTCHECK</a> at the RCPT TO:</a>. $RCPTCHECK is run in the same environment as qmail-smtpd. Additionally $SENDER is set to the envelope from and $RECIPIENT is set to the envelope recipient (for the current rcpt to:). Based on the return code (exit value) of $RCPTCHECK, the rcpt to: address will either be accepted or rejected.
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