Spamhaus: Lookup

Check to see if an IP address is blacklisted with one of nearly seventy DNS based blacklists (DNSBL) in our database which identify sources of spam.

DNSBL Information provides a single place where you can check that blacklist status of your mail server's IP address on more than 100 DNS based blacklists. To ...

Instantly check an email's SpamAssassin spam score with with Postmark's SpamAssassin API.

Instantly check IP/Email/Domain in 50+ anti-spam blacklists. Find proof of blacklist record in anti-spam databases. Enhance security now!

Email blacklists are a common way of reducing spam. If you don't know your mail server's address, start with a MX Lookup. Or, just send an email to ping ...

Check your newsletter's spam score and quality.This tool's free, and pretty.

SpamAssassin is a widely used spam filter that assigns a spam score of 0-10 to each email. We check your email with SpamAssassin and show you which issues were ...

Free tool to check spam trigger words in your email message. A quick and easy way to write better emails and avoid landing in spam.

Do you have problems sending email? Do you need to check if an IP address or domain name is on one of our blocklists? Relax, you ...

Check to see if IP/email addresses which have been reported as spam. IP & Email Abuse Reports. You can check with blacklist IP, Email or Domain.