Definition
A feedback loop sends reports to the sender whenever a recipient marks their email as spam. The report includes the email address and timestamp, allowing automatic suppression. Major ISPs offering FBL include Google Postmaster Tools, Yahoo FBL, and Microsoft SNDS. To use FBL data, you must configure a dedicated processing address (typically abuse@yourdomain.com), automate parsing of incoming reports, and immediately suppress any address that appears. Failure to honour FBL data results in escalating spam filtering and reputation damage.
Related Glossary Terms
AOL Mail for Email Marketers
AOL Mail is a legacy email provider with specific deliverability requirements and rendering quirks, now operating as part of the Yahoo+AOL network under shared infrastructure.
BIMI
BIMI (Brand Indicators for Message Identification) is an email standard that allows brands to display their logo next to their emails in supported email clients. It requires DMARC enforcement at quarantine or reject policy.
Bounce Rate Threshold
A bounce rate threshold is the percentage of hard or soft bounces at which email platforms and ISPs begin to penalise sender reputation, typically around 2-5%.
Bounce Rate
Email bounce rate is the percentage of emails that were rejected by the receiving server before reaching the recipient. It is a key indicator of list health and data quality.
Bulk Email Marketing
Bulk email marketing is the practice of sending a single email campaign to a large list of subscribers simultaneously, typically for promotional, newsletter, or announcement purposes.
CAN-SPAM Act
The CAN-SPAM Act is a US law that sets rules for commercial email. It requires accurate subject lines, a physical address, a clear opt-out mechanism, and prompt processing of unsubscribes. Violations can result in penalties up to $51,744 per email.