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spamhaus blacklisting


How to prevent SpamHaus SBL (Spamhaus Block List) blacklisting in web hosting servers

How to prevent SpamHaus SBL (Spamhaus Block List) blacklisting in web hosting servers

554 5.7.1 Service unavailable; Client host [154.0.***.**] blocked using zen.spamhaus.org; https://www.spamhaus.org/sbl/query/SBL289647
SMTP error from remote mail server after pipelined DATA:
    550-197.242.**.*** listed at zen.spamhaus.org

You’d seen these error messages in your mail server, if your IP address has ever got listed in Spamhaus SBL. Getting blacklisted in SBL is a concern for many web hosts, as it often leads to customer complaints about mail delivery failures.

Our engineers fix Spamhaus issues everyday in their role as Outsourced Support Specialists for web hosting providers. Since Spamhaus checks only for their SPAM criteria, we’ve seen that even perfectly legitimate business mails were tagged as spam. (more…)

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…)