📖 Glossary
What is Email Blacklist (Blocklist)?
A real-time list of IP addresses or domains identified as sources of spam, used by email providers to block incoming messages.
Detailed Explanation
Organizations like Spamhaus and Barracuda maintain widely used blocklists. If your IP or domain ends up on one of these lists, your emails will be blocked by many major inbox providers until you resolve the issue and request delisting. Blacklisting usually happens due to high spam complaints, hitting spam traps, or a compromised sending server. Regular list cleaning is essential to avoid blacklists.
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