Blocklist
A "Blocklist" is a database used by email servers and ISPs to prevent emails from known spam sources or malicious senders from reaching users' inboxes. When an IP address or domain is added to a blocklist, any emails sent from it are automatically filtered or blocked based on the policies of the receiving email system. Blocklists are a critical tool in the fight against spam and email-based threats.
Dynamic and Diverse: There are many blocklists, each with criteria for listing and delisting IP addresses and domains.
Preventive Measure: Being on a blocklist is a preventive measure to protect users from spam, phishing, and other email threats.
Check and Remediate: Senders can check if they are on a blocklist and take steps to be removed, usually by proving they have corrected the issues that led to the listing.
Impact on Deliverability: Being listed on a blocklist can severely impact email deliverability and sender reputation.
Good Email Practices: Adhering to best email practices and monitoring sending reputation can help avoid being listed on a blocklist.
Reputation Management: An e-commerce company regularly checks major blocklists to ensure their sending IP is not listed, maintaining their email deliverability.
Remediation Process: After finding their domain on a blocklist, a marketing agency cleans their email list and improves their sending practices, then requests removal from the blocklist.
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