What is a suppression list? A Clear Guide

A suppression list holds addresses you must never email again — hard bounces, complaints and unsubscribes. Honoring it protects reputation and keeps you legal.

Why it matters

Getting a suppression list right keeps you compliant and lands more mail 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 an AI watching list health and deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.