What is a feedback loop (FBL)? A Plain-English Guide
A feedback loop is a service from mailbox providers that tells you when a recipient marks your mail as spam, so you can suppress them immediately and protect your reputation.
Why it matters for deliverability
Understanding a feedback loop (FBL) is part of catching complaints before they sink your sender score. Get it right and more of your mail reaches the inbox; get it wrong and even legitimate mail can be filtered.
Related
How Rainmail helps
Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability — and it welcomes the senders Amazon SES, SendGrid and Mailchimp reject, from $8. Run the free 10-second checker or see plans.