Blocklist

Email Deliverability. A list of IP addresses, email addresses, or domains known to ISPs or list providers for sending unsolicited or unwanted emails.

Private companies own and operate databases that track mailing infrastructure (domains and IP addresses) that recipients or providers identified as a source of problematic email. This includes spam, phishing, spoofing, and script attacks.

To identify and filter illegitimate mail streams, major ISPs, inbox service providers and enterprises use their own or third-party blocklists.

Blocklisting services might impact deliverability. If you find your IP address on a blocklist, then submit a delisting request.