Spamhaus
Written by Eric Benson
Updated at August 25th, 2022
Overview
Spamhaus is the most well-respected and widely used blocklist in the world. A listing at Spamhaus will have a negative effect on your ability to deliver emails to your customer’s inbox and can cause bounce rates of over 50%. Evidence suggests that most of the top North American ISPs use Spamhaus to inform blocking decisions.
Spamhaus is a high-impact blocklist and email deliverability will be negatively effected.
How it works
Unlike many blocklists, Spamhaus lists senders manually. This means that they are proactively watching sender activity, collecting data, and basing the listings on a number of variables. Most commonly senders are listed for mailing to spam trap addresses that Spamhaus owns. Sometimes Spamhaus will list senders based on recipient feedback as well.
Remediation
Listings last until Spamhaus is satisfied that the offending sender has taken the appropriate steps to mitigate the problem. This blocklist does support a manual request to remove or delist your IP Address from their database. More information about Spamhaus and delisting procedures can be found at their website: http://www.spamhaus.org
Removal requests that are submitted without addressing the core problem are likely to cause your IP Address or Domain to be relisted with longer listing periods.