What an Email Blacklist Is
An email blacklist, more commonly called a blocklist, is a database of IP addresses or domains seen sending spam or showing spam-like behavior. Mailbox providers and spam filters check these lists when deciding whether to accept, filter or reject email.
Some blocklists are highly influential, such as those run by Spamhaus. Others are minor and have little effect on most mail.
IP Blocklists vs Domain Blocklists
List the servers that send email. If you use an email platform like AWeber, you usually send from servers the platform manages, and it monitors their reputation.
List domains found in spam, including in the From address or in links. Your own domain can be listed even if you use a reputable email platform.
How to Check If You're Listed
- Check your domain at the blocklist operator's own lookup tool, such as Spamhaus's checker.
- Use a multi-list checker that tests your domain or IP against many blocklists at once.
- Read bounce messages. Rejections often name the blocklist responsible.
If you're on a minor list but your emails are performing normally, it may not be worth worrying about. Focus on major lists and on any list named in your bounce messages.
Why Senders Get Listed
- Sending to old or purchased lists that contain spam traps.
- High complaint rates from recipients who didn't expect your email.
- Compromised accounts or websites sending spam without your knowledge.
- Links to domains that are themselves listed.
- Sudden large sends after long inactivity.
How to Get Removed
- Identify the exact list and read its stated reason for the listing.
- Pause sending to risky segments while you investigate.
- Fix the root cause: stop mailing purchased or old lists, secure compromised accounts, remove bad links.
- Request removal through the blocklist's official process, explaining what you changed.
- Rebuild carefully, sending only to engaged, opted-in subscribers.
Never pay a third party who promises to get you delisted. Reputable blocklists offer removal through their own sites. Some listings also expire automatically once the problem stops.
How to Avoid Being Listed
- Send only to people who opted in. See how to build an email list.
- Clean your list regularly. See email list hygiene.
- Authenticate your domain. See SPF, DKIM and DMARC setup.
- Keep complaints low by sending what you promised.
- Secure your website and accounts with strong passwords and updates.
If You Use AWeber
AWeber manages its sending infrastructure and reviews imports to keep purchased lists off the platform, which helps protect shared reputation. Your responsibility is your own list and domain: collect permission, authenticate your domain with custom DKIM and DMARC and keep complaints low. See AWeber deliverability.
Send from an authenticated domain to a permission-based list with AWeber, with bounce handling built in.
Email Blacklist FAQs
What is an email blacklist?
A database of IPs or domains associated with spam that mailbox providers use to filter email.
How do I know if my domain is blacklisted?
Check blocklist lookup tools such as Spamhaus's, and read any bounce messages for list names.
How long does it take to get off a blacklist?
It varies by list. Many process removal requests quickly once the cause is fixed; some listings expire automatically.
Should I pay to be removed from a blacklist?
No. Use the blocklist's official removal process.