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How Do Email Blacklists Work?

Email blacklists (or blocklists) are real-time databases maintained by independent organizations (like Spamhaus, SORBS, or Barracuda) that list IP addresses and domains known to send spam. When you send an email, the receiving mail server checks these blocklists. If your IP or domain is listed, the server will either reject the email or route it directly to the spam folder.

Why Did My Domain Get Blacklisted?

• High Spam Complaints: Too many recipients clicked the "Mark as Spam" button on your emails.
• Spam Traps: You emailed a "spam trap"—a hidden email address specifically designed to catch senders who scrape addresses or buy lists.
• Compromised Server: Your mail server or website was hacked and is being used by a third party to send outbound spam.
• Shared IP Address: If you use a shared IP (common with cheap hosting or marketing platforms), you might be penalized for the bad behavior of another sender on the same IP.

How to Get Removed from a Blacklist

If you find your domain or IP on a blocklist, do not panic. First, identify and fix the root cause (e.g., stop emailing purchased lists, secure your server, or clean your list). Then, visit the specific blocklist's website and follow their delisting process. Most blocklists offer a self-service removal form for first-time offenders.