Often know as an "email blacklist," an email blocklist is a list of blocked emails, domains, or IP addresses that are suspected of sending spam or malicious content. Blocklists are real-time databases meant to protect users and lower the mass of spam emails sent daily. There are multiple public blocklists, and they can be created by an email provider or an email user.
Why does ActiveCampaign use the term blocklist instead of blacklist?
Why does a domain get blocklisted?
How do I know if my email is blocklisted?
Why is Spamhaus blocking my email?
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