Which blacklists actually hurt you, how delisting works on each, how long it takes, and how outbound teams stop the re-listing cycle. No fees, no "delisting services" — every legitimate list removes you for free.
Start here: which lists are you on right now?
| List | Impact | Removal | Typical time |
|---|---|---|---|
| Spamhaus ZEN/SBL/DBL | Severe — most providers use it | Free form + appeal (guide) | 24–72h |
| Barracuda BRBL | High for B2B — corporate gateways | Free request form (guide) | 12–24h |
| SpamCop | Moderate | Auto-expires (guide) | ~24h after reports stop |
| SORBS | Low–moderate | Self-service via SORBS lookup | Hours–days |
| PSBL | Low | Self-service, instant | Minutes |
| UCEPROTECT | Low (aggressive by design) | Auto-expires in 7 days; they charge for "express" — never pay | 7 days |
| SURBL / URI lists | Moderate — your domain in links | Per-list form | Varies |
Rule of thumb: Spamhaus and Barracuda listings justify pausing campaigns. SpamCop and PSBL are warnings. UCEPROTECT Level 2/3 listings punish whole IP ranges you share — often not actionable by you and largely ignored by major providers.
No. Every list that matters delists for free. Paid "delisting services" either fill in the same free forms or are outright scams. UCEPROTECT's "express delisting" fee is widely considered a reason providers ignore that list.
Domain blacklists (Spamhaus DBL, SURBL) list the domain appearing in your links or From header. IP delisting won't help; you need the domain-specific process, and to find which mail stream burned the domain.
That's monitoring, not checking: automated sweeps against all major lists with alerts on change — which is what Aurelius does.
Deep dives: Spamhaus · Barracuda · SpamCop · Tools: Blacklist Checker · Domain Grader