What is spam complaint rate? A Clear Guide

Your complaint rate is the share of recipients who mark you as spam. Gmail and Yahoo require it under 0.3%; above that, delivery collapses.

Why it matters

Knowing spam complaint rate helps you land in the inbox. See the deliverability checklist.

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 a REST API and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.