One list says listed. Is that bad?

Email blacklist check

Is your mail server or domain listed as a spam source, and by whom?

Live lookupPlain English + technicalFree, no sign-upblacklist.middle.network

Each tile is one blacklist. Red means listed.
“Blocked” means the list refused our query (common with free tiers), not that you’re listed.

The health check runs this and 30 more checks on a domain, then ranks what to fix.

Check an IP address or domain against major DNS blacklists (DNSBLs) like Spamhaus and Barracuda, with what each listing means.

Every result comes in two styles: plain English for everyone, and the exact technical detail for engineers, with the raw JSON one click away.

It depends on the list. Spamhaus listings hurt a lot; small lists rarely matter.