Email blacklists (blocklists) are lists of domains and IP addresses known for sending spam. If you are listed, many of your emails may be rejected or sent to spam.
How businesses get listed
- Sending to bought or scraped lists.
- Hitting spam traps (old or fake addresses).
- High spam complaint rates.
- A hacked website or email account sending spam.
- Sharing an IP with spammers on cheap hosting.
How to check
Use online blacklist lookup tools to check your domain and sending IP. Your email platform may also alert you.
Getting removed
- Find and fix the cause first: hacked account, bad list or misconfiguration.
- Clean your list with our email list cleaner.
- Set up authentication with our SPF and DMARC generator.
- Request removal through each blacklist’s official process.
- Some lists remove automatically after a period without spam.
Prevention
- Permission-based lists only.
- Regular list cleaning.
- Secure email accounts with two-factor authentication.
- Reputable email platforms.
Read why emails go to spam.
Want the full picture? This article is part of Email marketing: the complete guide, our in-depth guide with everything in one place.
