2016-05-19 06:51:20 -05:00
<!DOCTYPE html>
2015-03-13 22:34:58 -06:00
< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=utf-8" / >
< title > Enable DNSBL service in Postfix to reduce spam< / title >
2015-07-31 23:14:52 -05:00
< link rel = "stylesheet" type = "text/css" href = "./css/markdown.css" / >
2015-03-13 22:34:58 -06:00
< / head >
< body >
< div id = "navigation" >
2016-04-19 12:48:51 -05:00
< a href = "/index.html" target = "_blank" >
< img alt = "iRedMail web site"
src="./images/logo-iredmail.png"
style="vertical-align: middle; height: 30px;"
/>
< span > iRedMail< / span >
< / a >
2016-02-29 02:15:19 -06:00
// < 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 >
2016-03-14 08:24:40 -06:00
< div class = "admonition note" >
< p class = "admonition-title" > Important Note< / p >
< p > 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
< code > zen.spamhaus.org< / code > may improperly reply if your server exceed the DNS
query limit. Also, mail service higly relies on DNS queries, so a local
2015-06-13 11:07:45 -05:00
DNS server speeds up the mail flow.< / p >
2016-03-14 08:24:40 -06:00
< / div >
2015-03-13 22:34:58 -06:00
< p > You can enable additional DNSBL services in Postfix to reduce spam. We use
< code > zen.spamhaus.org< / code > for example below.< / p >
< ul >
< li > Open Postfix config file < code > /etc/postfix/main.cf< / code > or
< code > /usr/local/etc/postfix/main.cf< / code > (on FreeBSD), append
< code > reject_rbl_client zen.spamhaus.org< / code > to parameter < code > smtpd_recipient_restrictions< / code > .
Final setting looks like below:< / li >
< / ul >
2016-03-02 10:08:29 -06:00
< pre > < code > smtpd_recipient_restrictions =
...
reject_unauth_destination
reject_rbl_client zen.spamhaus.org
2015-03-13 22:34:58 -06:00
< / code > < / pre >
< p > It must be placed after < code > reject_unauth_destination< / code > . You can add more DNSBL
services after < code > reject_unauth_destination< / code > , and they will be queried in the
specified order.< / p >
< ul >
< li > Restart or reload Postfix service is required.< / li >
< / ul >
2016-03-02 10:08:29 -06:00
< div class = "admonition note" >
< p class = "admonition-title" > Another popular DNSBL server< / p >
< p > Another popular DNSBL server address is < code > b.barracudacentral.org< / code > . For more
details, please read its web site:
< a href = "http://www.barracudacentral.org/rbl" > Barracuda Reputation Block List (BRBL)< / a > < / p >
< / div >
2015-08-19 06:55:27 -05:00
< h2 id = "see-also" > See also< / h2 >
< ul >
< li > < a href = "./enable.postscreen.html" > Enable postscreen service< / a > < / li >
< / ul >
2015-03-13 22:34:58 -06:00
< h2 id = "references" > References< / h2 >
< ul >
2015-03-13 23:03:38 -06:00
< li > < a href = "http://www.postfix.org/postconf.5.html#reject_rbl_client" > Postfix Configuration Parameters: reject_rbl_client< / a > < / li >
2015-03-13 22:34:58 -06:00
< li >
< p > < a href = "http://www.spamhaus.org" > Spamhaus website< / a > < / p >
< ul >
< li > < a href = "https://www.spamhaus.org/organization/dnsblusage/" > Spamhaus DNSBL Usage Terms< / a > < / li >
< / ul >
< / li >
2016-05-19 06:51:20 -05:00
< / ul > < div class = "footer" >
< p style = "text-align: center; color: grey;" > All documents are available in < a href = "https://bitbucket.org/zhb/iredmail-docs/src" > BitBucket repository< / a > , and published under < a href = "http://creativecommons.org/licenses/by-nd/3.0/us/" target = "_blank" > Creative Commons< / a > license. You can < a href = "https://bitbucket.org/zhb/iredmail-docs/get/tip.tar.bz2" > download the latest version< / a > for offline reading. If you found something wrong, please do < a href = "http://www.iredmail.org/contact.html" > contact us< / a > to fix it.< / p >
< / div >
< script type = "text/javascript" >
2015-03-13 22:34:58 -06:00
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-3293801-21', 'auto');
ga('send', 'pageview');
< / script >
< / body > < / html >
