Feedbackloop
Complaint Feedback Loops are feedback in form of ARF reports, usually sent by E-Mail to a previously registered address. Feedbackloops are sent by ISP's to senders when mail from the sender in question has been marked as SPAM. Some feedbackloops are registered by IP, meaning a complaint report is sent when a mail from a certain IP is marked SPAM, and others by domain, meaning a complaint report is sent when a mail from a certain domain is marked SPAM.
Complaint Feedback Loops have two functionalities:
- To detect IPs, domains and brands that are sending unwanted E-Mail.
- To unsubscribe recipients that have marked message(s) as SPAM.
List of free and independent feedbackloops
| Name | Registration Link | IP/Domain based | Note |
|---|---|---|---|
| 1&1 | Register via the Postmaster page. | IP | Only for mail.com, web.de and various gmx domains. |
| Earthlink | fblrequest@abuse.earthlink.net | IP | E-Mail registration. Send it from the address that's to be registered and don't forget to mention your IPs! |
| Google Postmaster | https://gmail.com/postmaster/ | IP/Domain | No E-Mail reports. |
| mail.ru | https://postmaster.mail.ru/ | Domain | Read https://help.mail.ru/enpostmaster/technical-settings/fbl. |
| Microsoft | https://postmaster.live.com/snds/JMRP.aspx | IP | E-Mail reports are not in ARF. |
| SpamCop | https://www.spamcop.net/anonsignup.shtml | IP | Not directly provided by an ISP |
| Yahoo | https://senders.yahooinc.com/contact | Domain |
Paid Feedbackloop subscriptions
In addition to the above list, it's possible to register for a list of collective Feedbackloops from various small ISPs via Validity's Feedbackloop Service (fbl.validity.com). It used to be a free service, but since September 2023, receiving ARF reports via E-mail via this service costs $1.500 per year. The service covers the following ISPs:
- Bluetie
- Comcast
- Fastmail
- gandi.net
- LaPoste.net
- Libero (Italiaonline)
- Liberty Global (Chello, UPC, and UnityMedia)
- Locaweb
- OpenSRS/Hostedmail (Tucows)
- Rackspace
- Seznam
- SFR
- SilverSky
- Swisscom
- Synacor
- Telecom Italia
- Telenet
- Telenor
- Telstra
- Terra
- UOL
- Virgilio
- Virgin Media
- Yandex
- Ziggo
Standardisation
In May 2023, work on standardisation of Complaint Feedback Loop via Complaint Feedback Loop Address Headers was started. Acceptance of this proposed standard would obsolete all paid feedbackloops, providing a standardised, open and free subscription mechanism.