What to do if you are listed
- Find the cause: an infected machine on the network, a hijacked mailbox, an open relay, or bulk mail without opt-in. Until the cause is fixed, the address will be listed again.
- Check your mail setup: the server’s PTR record, SPF, DKIM and DMARC. You can see all of it in the DNS lookup.
- Request removal using the “How to delist” link. Many lists, such as SpamCop, drop an address on their own within 24–48 hours once the spam stops.
Which lists matter
Large mailbox providers and corporate filters mostly use Spamhaus, Barracuda, SpamCop and Mailspike, marked as “major”. UCEPROTECT L2 and L3 list whole networks and providers and rarely block mail on their own. Gmail, Outlook and Yahoo rely mostly on their own sender reputation.
Queries go from your browser through Cloudflare DNS-over-HTTPS. Spamhaus, Barracuda and URIBL do not answer public resolvers, so for those we link to the check on their site.