ISP Feedback Loops

A Feedback Loop (FBL) is a system by which an Internet Service Provider provides the sender a copy of the message that one of their subscribers has reported as spam — usually by hitting a “report spam” button in that ISP’s mail interface.

ISPs offer feedback loops to qualified senders, so the senders can identify subscribers who no longer want to receive similar mail and/or any problems originating from their networks, such as virus-infected spam-producing machines.

This page summarizes the information about FBL signup pages, whitelist pages, and postmaster pages of most popular ISPs around the world.

ISP FBL Signup Whitelist Signup Postmaster Page
AOL AOL FBL signup does not provide AOL postmaster
AT&T does not provide does not provide AT&T postmaster
Bellsouth does not provide does not provide Bellsouth postmaster
Comcast Comcast FBL signup does not provide Comcast postmaster
centrum.cz Centrum FBL signup by email does not provide does not provide
Cox Cox FBL signup does not provide Cox postmaster
Earthlink Earthlink FBL signup does not provide does not provide
Excite (Bluetie) Excite FBL signup does not provide Excite postmaster
FastMail FastMail FBL signup does not provide does not provide
Gmail Gmail FBL signup (ESP only) does not provide Gmail postmaster
Hotmail Hotmail FBL signup does not provide Hotmail postmaster
Mail.ru Mail.ru FBL signup does not provide Mail.ru postmaster
Outblaze Outblaze FBL signup does not provide does not provide
Rackspace Rackspace FBL signup does not provide Rackspace postmaster
Synacor Synacor FBL signup does not provide does not provide
Terra.com.br does not provide does not provide
Tucows Tucows FBL signup does not provide does not provide
UnitedOnline (NetZero/Juno) does not provide UnitedOnline Whitelist signup UnitedOnline postmaster
USA.net USA.net FBL signup does not provide USA.net postmaster
Verizon does not provide Verizon Whitelist signup does not provide
Yahoo! Yahoo! FBL signup Yahoo! Whitelist signup Yahoo! postmaster
Yandex Yandex FBL signup does not provide Yandex postmaster
ZOHO ZOHO FBL signup does not provide does not provide