New: howto/enable.dnsbl.md.
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# Enable DNSBL service in Postfix to reduce spam
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You can enable additional DNSBL services in Postfix to reduce spam. We use
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`zen.spamhaus.org` for example below.
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* Open Postfix config file `/etc/postfix/main.cf` or
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`/usr/local/etc/postfix/main.cf` (on FreeBSD), append
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`reject_rbl_client zen.spamhaus.org` to parameter `smtpd_recipient_restrictions`.
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Final setting looks like below:
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```
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smtpd_recipient_restrictions = ..., reject_unauth_destination, reject_rbl_client zen.spamhaus.org
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```
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It must be placed after `reject_unauth_destination`. You can add more DNSBL
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services after `reject_unauth_destination`, and they will be queried in the
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specified order.
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* Restart or reload Postfix service is required.
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## References
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* [Postfix Configuration Parameters: reject_rbl_client](http://www.iredmail.org/postconf.5.html#reject_rbl_client)
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* [Spamhaus website](http://www.spamhaus.org)
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* [Spamhaus DNSBL Usage Terms](https://www.spamhaus.org/organization/dnsblusage/)
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Enable DNSBL service in Postfix to reduce spam</title>
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<link href="./css/markdown.css" rel="stylesheet"></head>
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</head>
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<body>
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<div id="navigation">
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<a href="http://www.iredmail.org" target="_blank">iRedMail web site</a>
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// <a href="./index.html">Document Index</a>
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</div><h1 id="enable-dnsbl-service-in-postfix-to-reduce-spam">Enable DNSBL service in Postfix to reduce spam</h1>
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<p>You can enable additional DNSBL services in Postfix to reduce spam. We use
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<code>zen.spamhaus.org</code> for example below.</p>
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<ul>
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<li>Open Postfix config file <code>/etc/postfix/main.cf</code> or
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<code>/usr/local/etc/postfix/main.cf</code> (on FreeBSD), append
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<code>reject_rbl_client zen.spamhaus.org</code> to parameter <code>smtpd_recipient_restrictions</code>.
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Final setting looks like below:</li>
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</ul>
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<pre><code>smtpd_recipient_restrictions = ..., reject_unauth_destination, reject_rbl_client zen.spamhaus.org
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</code></pre>
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<p>It must be placed after <code>reject_unauth_destination</code>. You can add more DNSBL
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services after <code>reject_unauth_destination</code>, and they will be queried in the
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specified order.</p>
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<ul>
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<li>Restart or reload Postfix service is required.</li>
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</ul>
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<h2 id="references">References</h2>
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<ul>
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<li><a href="http://www.iredmail.org/postconf.5.html#reject_rbl_client">Postfix Configuration Parameters: reject_rbl_client</a></li>
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<li>
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<p><a href="http://www.spamhaus.org">Spamhaus website</a></p>
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<ul>
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<li><a href="https://www.spamhaus.org/organization/dnsblusage/">Spamhaus DNSBL Usage Terms</a></li>
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</ul>
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</li>
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</ul><p style="text-align: center; color: grey;">Document published under a <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">CC BY-ND 3.0</a> license. If you found something wrong, please do <a href="http://www.iredmail.org/contact.html">contact us</a> to fix it.<script>
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(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
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})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
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ga('create', 'UA-3293801-21', 'auto');
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ga('send', 'pageview');
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</script>
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</body></html>
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@ -57,6 +57,7 @@
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<li><a href="amavisd.per-recipient.policy.lookup.html">Amavisd: Enable per-recipient policy lookup</a></li>
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<li><a href="change.hostname.html">Change server hostname</a></li>
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<li><a href="dovecot.master.user.html">Dovecot Master User</a></li>
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<li><a href="enable.dnsbl.html">Enable DNSBL service in Postfix to reduce spam</a></li>
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<li><a href="force.user.to.change.password.html">Force mail user to change password in 90 days</a></li>
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<li><a href="ignore.trash.folder.in.quota.html">Ignore Trash folder in mailbox quota</a></li>
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<li><a href="ldap.add.alias.domain.html">LDAP: Add an alias domain</a></li>
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@ -23,7 +23,6 @@
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<li><a href="#fixed-incorrect-path-of-command-sogo-tool-on-openbsd">Fixed: Incorrect path of command sogo-tool on OpenBSD</a></li>
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<li><a href="#optional-setup-fail2ban-to-monitor-password-failures-in-sogo-log-file">[OPTIONAL] Setup Fail2ban to monitor password failures in SOGo log file</a></li>
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<li><a href="#optional-add-two-more-fail2ban-filter-regular-expressios-to-help-catch-spam">[OPTIONAL] Add two more Fail2ban filter regular expressios to help catch spam</a></li>
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<li><a href="#optional-enable-dnsbl-service-zenspamhausorg-in-postfix-to-reduce-spam">[OPTIONAL] Enable DNSBL service zen.spamhaus.org in Postfix to reduce spam</a></li>
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</ul>
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</li>
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<li><a href="#openldap-backend-special">OpenLDAP backend special</a><ul>
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@ -247,22 +246,6 @@ ignoreregex =
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</code></pre>
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<p>Restarting Fail2ban service is required.</p>
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<h3 id="optional-enable-dnsbl-service-zenspamhausorg-in-postfix-to-reduce-spam">[OPTIONAL] Enable DNSBL service zen.spamhaus.org in Postfix to reduce spam</h3>
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<p>Note: this is optional. It's enabled by default since iRedMail-0.9.1.</p>
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<ul>
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<li>Open Postfix config file <code>/etc/postfix/main.cf</code> or
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<code>/usr/local/etc/postfix/main.cf</code> (on FreeBSD), append
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<code>reject_rbl_client zen.spamhaus.org</code> to parameter <code>smtpd_recipient_restrictions</code>.
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Final setting looks like below:</li>
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</ul>
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<pre><code>smtpd_recipient_restrictions = ..., reject_unauth_destination, reject_rbl_client zen.spamhaus.org
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</code></pre>
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<ul>
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<li>Restart or reload Postfix service.</li>
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</ul>
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<p>You can read <a href="http://www.spamhaus.org">spamhaus.org</a> for more details about its
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RBL service.</p>
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<h2 id="openldap-backend-special">OpenLDAP backend special</h2>
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<h3 id="fixed-not-backup-sogo-database">Fixed: not backup SOGo database</h3>
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<p>Note: this step is not applicable if you don't use SOGo groupware.</p>
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@ -235,24 +235,6 @@ ignoreregex =
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Restarting Fail2ban service is required.
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### [OPTIONAL] Enable DNSBL service zen.spamhaus.org in Postfix to reduce spam
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Note: this is optional. It's enabled by default since iRedMail-0.9.1.
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* Open Postfix config file `/etc/postfix/main.cf` or
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`/usr/local/etc/postfix/main.cf` (on FreeBSD), append
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`reject_rbl_client zen.spamhaus.org` to parameter `smtpd_recipient_restrictions`.
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Final setting looks like below:
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```
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smtpd_recipient_restrictions = ..., reject_unauth_destination, reject_rbl_client zen.spamhaus.org
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```
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* Restart or reload Postfix service.
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You can read [spamhaus.org](http://www.spamhaus.org) for more details about its
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RBL service.
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## OpenLDAP backend special
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### Fixed: not backup SOGo database
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