A feedback loop (FBL) is a service offered by mailbox providers that tells a sender when a recipient marks their email as spam. Instead of silently hurting your reputation, the complaint is reported back so you can remove that address and stop mailing people who don't want your messages.
How a feedback loop works
When a subscriber hits "mark as spam," a participating provider forwards that complaint to the sender or their platform. The sender should immediately suppress the complainer to avoid repeat complaints. Complaints feed directly into your spam complaint rate and sender reputation. Mailpro processes complaints automatically alongside its anti-spam tools.
Why it matters
Acting on FBL complaints keeps your complaint rate low and protects inbox placement — ignoring them is a fast track to the spam folder or a blacklist. Learn how to reduce your spam complaint rate. Related: deliverability.
Mailpro and deliverability
Turn complaints into a cleaner list
Mailpro processes feedback-loop complaints automatically and suppresses complainers, so your reputation stays protected.