Private email infrastructure & deliverability engineering
northboundmail.net
NorthboundMail Systems
Est. 2011 — SMTP infrastructure & deliverability
Infrastructure

Feedback Loop Integration

Registration and processing of ISP feedback loops — JMRP, Yahoo CFL, Comcast, La Poste, Mail.ru — routed into suppression and complaint analysis. Without FBLs, complaint rates are guesswork.

Overview

Feedback loops are the mechanism by which mailbox providers report user complaints back to senders. Registering for them is a prerequisite for serious sending. Processing them correctly — deduplicating, attributing to the correct campaign, and enforcing suppression — is a second prerequisite.

Northbound registers every eligible feedback loop for our IPs and domains, processes the ARF reports, and enforces immediate suppression on the complaining address across all client streams.

Benefits

  • Registered across every provider offering an FBL
  • ARF reports parsed, deduplicated, and attributed to the sending campaign
  • Complainants suppressed immediately across all streams
  • Trend analysis surfaces content or list issues before they become blocklist listings

Technical specifications

ProvidersMicrosoft (JMRP), Yahoo (CFL), Comcast, Mail.ru, La Poste, Fastmail
AttributionPer-message headers correlated to campaign, list and creative

Use cases

  • — Any sender with volume to Outlook and Hotmail
  • — Marketers whose complaint rate is drifting upward without a clear cause

Questions

Does Gmail offer a feedback loop?
Not in the classic ARF sense. Gmail exposes aggregate complaint data through Postmaster Tools, which we monitor separately.

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