LashBack

Overview

LashBack's unsubscribe blocklist is a real-time blocklist of IP addresses which have not honored unsubscribe procedures and sent email to email addresses on suppression files. There are approximately one million IPs on the list and it is updated on an hourly basis.

How it works

LashBack lists IPs using the following criteria:

• IP addresses that send email to specially-created, LashBack owned-and-monitored email addresses (unsubscribe probes), which are used only on suppression lists, are added to the blocklist.

Remediation

This blocklist does support a manual request to delist your IP Address from their database. You can delist an IP address free of charge once every 30 days. More information about LashBack and delisting procedures can be found at their website: https://blacklist.lashback.com/