SpamHaus CBL or Composite Blocking List is a list of IPs that is known to send spam, or is found to have a bot infected website.
Here at Bobcares, we help website and server owners delist blacklisted IPs, and maintain their servers to prevent future infections or blacklisting.
Most CBL blacklist removal requests begin by site owners reporting either a bounced mail or a failed website scan. (more…)
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…)
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…)