A feedback loop (FBL) is response from ISPs to senders that report back complaints when a subscriber/receiver hits the spam or junk button in their inbox.
Unfortunately, not all Email Service Providers offer feedback loop feature. Below is the list of Email Service Providers that offer feedback loop feature:
- AOL
- Bluetie/Excite
- Comcast
- Cox
- Fastmail
- Hotmail
- Italia Online/Libero
- Locaweb
- Mail.ru
- OpenSRS/Tucows
- Rackspace (formerly Mailtrust)
- RoadRunner/Time Warner Cable
- Synacor
- Telenor
- Terra
- USA.NET
- United Online/Juno/Netzero
- XS4ALL
- Yahoo!
- Yandex
- Zoho.com
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