Feedback loop(FBL)

FBL is a short form for Feedback Loop. It is a service that is provided ISPs and ESP that allows email senders to receive feedback on their email campaigns.

When a recipient marks an email as spam, the ISP or email service provider sends a notification to the email sender through the feedback loop service. This allows the sender to identify and take action on email addresses that may be causing delivery issues, and improve their email content and practices to reduce the likelihood of their emails being marked as spam in the future.

Here is a list of some popular FBLs:

AOL Feedback Loop
Comcast Feedback Loop
Cox Feedback Loop
Gmail Feedback Loop
Microsoft Junk Email Reporting Program (JMRP)
Yahoo! Mail Complaint Feedback Loop (CFL)
Yandex Feedback Loop
Zoho Feedback Loop

Note that each FBL may have its own specific requirements and processes for registration and usage. Email senders should review the documentation provided by each FBL to ensure they meet the requirements for participation. but you can sign maximum FBLS using https://fbl.validity.com

Here is a more comprehensive list of Feedback Loop (FBL):

FBL work by providing email senders with information about how their emails are being perceived by recipients. Here is a general overview of how FBLs work:

Email recipient marks an email as spam: When a recipient receives an email they believe to be spam, they may mark it as such by clicking the “Report as Spam” or similar button in their email client.

FBL notification is sent to the email sender or IP owners based on the DKIM sign When the recipient marks an email as spam, the recipient’s email service provider (ESP) or ISP sends a notification to the email sender via the FBL service.

Overall, FBLs provide a valuable feedback mechanism for email senders to help improve their email practices and maintain a good sender reputation.