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Recommend to setup a local DNS server if you're running a high-traffic mail server.

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Zhang Huangbin 2015-06-14 00:07:45 +08:00
parent 99c81b2346
commit 4deddd669e
3 changed files with 13 additions and 1 deletions
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howto/enable.dnsbl.md
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# Enable DNSBL service in Postfix to reduce spam
> Important note: if you're running a high-traffic mail server, you'd better
> setup a local DNS server to cache DNS queries, because free RBL services
> like zen.spamhaus.org may improperly reply if your server exceed the limit
> DNS queries. Also, mail service higly relies on DNS queries, so a local
> DNS server speeds up the mail flow.
You can enable additional DNSBL services in Postfix to reduce spam. We use
`zen.spamhaus.org` for example below.

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html/enable.dnsbl.html
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// <a href="./index.html">Document Index</a>
</div><h1 id="enable-dnsbl-service-in-postfix-to-reduce-spam">Enable DNSBL service in Postfix to reduce spam</h1>
<blockquote>
<p>Important note: if you're running a high-traffic mail server, you'd better
setup a local DNS server to cache DNS queries, because free RBL services
like zen.spamhaus.org may improperly reply if your server exceed the limit
DNS queries. Also, mail service higly relies on DNS queries, so a local
DNS server speeds up the mail flow.</p>
</blockquote>
<p>You can enable additional DNSBL services in Postfix to reduce spam. We use
<code>zen.spamhaus.org</code> for example below.</p>
<ul>

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html/index.html
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<li><a href="translate.iredadmin.html">iRedAdmin-Pro: Translate iRedAdmin to your local language</a></li>
<li><a href="backup.restore.html">Backup and restore</a></li>
<li><a href="file.locations.html">Locations of configuration and log files of mojor components</a></li>
<li><a href="manage.wblist.html">Manage white/blacklists</a></li>
</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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