Blacklist Lookup: Check DNS Blocklists

Blacklist Lookup

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Mail servers and filters use DNS blocklists to spot sources of spam. If your domain or server IP ends up on one, your emails may bounce or land in spam folders.

How to use it

1. Enter a domain.
2. Run the lookup against the list of blocklists.
3. Look for any entries marked as listed.

If you're listed

Find out why first. Common causes are a compromised account, an infected site, or shared hosting with a bad neighbor. Fix the cause, then follow the delisting process on that blocklist's website. Some lists expire entries automatically after a while.