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Prevent SpamHaus PBL (Policy Block List) blacklisting in web hosting servers

Prevent SpamHaus PBL (Policy Block List) blacklisting in web hosting servers

554 5.7.1 Service unavailable; Client host [203.0.113.XXX] blocked using zen.spamhaus.org; https://www.spamhaus.org/pbl/query/PBL289647
554 mysev mysmtp 203.0.113.XXX is on the Spamhaus PBL Please visit: http://www.spamhaus.org/query/bl?ip=203.0.113.XXX

If you’ve received one such error message, you are not alone. Mail bounces due to SpamHaus PBL blacklisting is a common issue faced by web hosts around the world. (more…)