WQI.webqualityindex

Vendor / platform

Yahoo, Microsoft, and Google (feedback loops)

Mailbox-provider feedback-loop programs that surface complaint reports to bulk senders, enabling reputation hygiene.

Short name: Yahoo / Microsoft / Google
Scope: Vendor / platform
Homepage: senders.yahooinc.com
Standards governed: 1

Standards governed by Yahoo / Microsoft / Google

Mailbox provider feedback loops (FBL) Per-provider global Email health Per-IP and per-domain complaint reports from major mailbox providers. The only direct signal that recipients are flagging your mail as spam — register or fly blind.