Check email blocklists
See whether an IPv4 address, or the mail server for a domain, is on four widely used email blocklists, and where to ask for removal. No account.
Authentication is the part you control
Email Digit publishes and maintains your SPF, DKIM and DMARC records, rotates your DKIM keys, and moves your DMARC policy toward reject as your reports allow, so receivers can tell your mail from mail that only claims to be yours.
What an email blocklist is
A blocklist is a public list of addresses that recently sent spam or showed signs of a compromised server. Many receiving servers check it before accepting mail, so a listing can mean rejected or junked mail for everything sent from that address.
Shared addresses
If you send through a service, you usually share its addresses with other senders, and a listing may come from someone else's mail. That is a question for the service, not a change you can make in your own DNS.
What the check covers
Four widely used IPv4 blocklists, each with its own result: listed, not listed, or no usable answer. Private and reserved addresses are refused, because no blocklist can list them.
Blocklist questions
Which address should I check?
The address your mail is sent from. If you send through a service, that is the service's sending address, which you can find in the Received headers of a message you sent. Entering a domain checks the server that receives its mail, which is often not the one that sends it.
How do I get removed from a list?
Find out why the address was listed, fix that first, then use the list's own removal page. Most lists also remove an address on their own once the problem stops. Removal requests made before the cause is fixed usually end in a quick relisting.
Why does a list show as unknown?
The list did not give a usable answer. Some lists refuse queries that come through large shared networks, and some time out. Unknown is not the same as clear, so check that list on its own site.
Not listed anywhere. Am I fine?
Only for these lists. Large mailbox providers mostly rely on their own reputation data, which no public lookup can show, so mail can land in spam with a clean blocklist result.