email blacklist

An email blacklist is a list of email addresses, domains, or IP addresses that are blocked or marked as spam by email providers. Organizations and email services use blacklists to prevent unwanted or malicious messages from reaching inboxes, helping reduce spam, phishing, and malware. If your email or domain is on such a list, your messages may be automatically rejected or sent to spam folders. Being blacklisted often indicates that your emails were reported as unwanted or suspicious. To avoid this, send emails responsibly, maintain good list hygiene, and follow best practices for email communication.