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 |
| BlueTie | BlueTie FBL signup | does not provide | BlueTie 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 |
| LaPoste.net | Universal FBL service signup | does not provide | LaPoste.net postmaster |
| Libero (Italiaonline) | Italiaonline FBL signup | does not provide | does not provide |
| Liberty Global (Chello, UPC, and UnityMedia) | Universal FBL service signup | does not provide | does not provide |
| Locaweb | Locaweb FBL signup | does not provide | Locaweb postmaster |
| Mail.ru | Mail.ru FBL signup | does not provide | Mail.ru postmaster |
| OpenSRS (Tucows) | OpenSRS FBL signup | does not provide | postmaster@opensrs.com |
| Outblaze | Outblaze FBL signup | does not provide | does not provide |
| Rackspace | Rackspace FBL signup | does not provide | Rackspace postmaster |
| Seznam.cz | Seznam FBL signup | does not provide | Seznam postmaster |
| Synacor | Synacor FBL signup | does not provide | does not provide |
| Swisscom (Bluewin) | Universal FBL service signup | does not provide | Swisscom postmaster |
| Telecom Italia | Universal FBL service signup | does not provide | does not provide |
| Telenet | Universal FBL service signup | does not provide | does not provide |
| Telenor | Universal FBL service signup | does not provide | does not provide |
| Telstra | Universal FBL service signup | does not provide | does not provide |
| Terra.com.br | Terra FBL signup | does not provide | Terra postmaster |
| UnitedOnline (NetZero/Juno) | Report Junk Mail | UnitedOnline Whitelist signup | UnitedOnline postmaster |
| UOL | UOL FBL signup | does not provide | UOL postmaster |
| USA.net | Universal FBL service signup | does not provide | USA.net postmaster |
| Verizon | Verizon FBL signup | does not provide | Verizon postmaster |
| Virgilio | Universal FBL service signup | does not provide | Virgilio postmaster |
| Virgin Media | Universal FBL service signup | does not provide | does not provide |
| XS4ALL | Universal FBL service signup | does not provide | does not provide |
| Yahoo! | Yahoo! FBL signup | does not provide | Yahoo! postmaster |
| Yandex | Yandex FBL signup | does not provide | Yandex postmaster |
| Ziggo | Universal FBL service signup | does not provide | does not provide |
| ZOHO | ZOHO FBL signup | does not provide | does not provide |