Blocklist check
Type a domain or the IP address of a mail server. We look up the mail servers of the domain and ask the best-known blocklists about each one.
Listed by mistake? Every list has its own removal page: search for the list name plus "delist". Fix the cause first (open relay, compromised mailbox, missing SPF/DKIM), or the listing comes back.
Why this matters after a migration
When you move to a new provider, your mail starts leaving from their servers. Those are usually clean, but your own domain can still be listed from an earlier problem, and a server of a small hosting company can share an address with a spammer. Checking on the switch day saves a week of "my mail goes to spam" tickets.