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< title > Enable DNSBL service in Postfix to reduce spam< / title >
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< a href = "http://www.iredmail.org" target = "_blank" > < img alt = "iRedMail web site" src = "images/logo-iredmail.png" style = "vertical-align: middle; height: 30px;" / > < span > iRedMail< / span > < / 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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< 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
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like zen.spamhaus.org may improperly reply if your server exceed the
DNS query limit. Also, mail service higly relies on DNS queries, so a local
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DNS server speeds up the mail flow.< / p >
< / blockquote >
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< 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 >
< pre > < code > smtpd_recipient_restrictions = ..., reject_unauth_destination, reject_rbl_client zen.spamhaus.org
< / 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 >
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< li > Restart or reload Postfix service is required.< / li >
< / ul >
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< h2 id = "see-also" > See also< / h2 >
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< li > < a href = "./enable.postscreen.html" > Enable postscreen service< / a > < / li >
< / ul >
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< h2 id = "references" > References< / h2 >
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< li > < a href = "http://www.postfix.org/postconf.5.html#reject_rbl_client" > Postfix Configuration Parameters: reject_rbl_client< / a > < / li >
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< p > < a href = "http://www.spamhaus.org" > Spamhaus website< / a > < / p >
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< li > < a href = "https://www.spamhaus.org/organization/dnsblusage/" > Spamhaus DNSBL Usage Terms< / a > < / li >
< / ul >
< / li >
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