Definition: The Unsubscribe Blacklist (UBL) is a real-time blacklist of IP addresses
which are sending email to names harvested from suppression files.
|New IPs in the last 48 hours
|IPs Removed in the last 48 hours
|Delist Requests in the last 48 hours
|Total IPs Listed
Utilizing the world's largest unsubscribe intelligence database, LashBack's Unsubscribe
Blacklist (UBL) empowers your organization to identify and block the very worst
unsubscribe abusers; those that send email to addresses which have been harvested
from suppression lists.
LashBack has been monitoring sender unsubscribe compliance since 2003. During this
period, LashBack has compiled sender unsubscribe compliance failure in four primary
- Which senders fail to provide a working unsubscribe mechanism
- Which senders do not honor unsubscribe requests within 10 business days
- Which senders allow consumers unsubscribe request to be abused (i.e., shared with
other parties to send more spam)
- Which senders are taking suppression lists from other organizations and sending
email to these lists
LashBack's UBL only lists the IP addresses of senders who are using email addresses
harvested from suppression lists (point 4). If you would like additional 'premium'
reputation data contact a LashBack representative
This free service is intended to provide all receivers and reputation providers
a baseline of data to help block the sender's with the worst reputations. All IP
addresses listed on in our service are being continually monitored and the list
is updated hourly.