What is an email blocklist? A Clear Guide

A blocklist lists IPs or domains believed to send spam. Being listed on Spamhaus or similar blocks your mail at many receivers.

Why it matters

Knowing an email blocklist 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.