0spam, which used to be called FusionZero, lists IPs based on spam trap hits, spam reports, and automated scoring. Older mail servers still check it under the FusionZero name, so you may see either one in a bounce.
Create a free account on 0spam.org, confirm your contact details, and request removal while logged in, explaining what you fixed. Most requests are handled automatically in about 20 minutes; ones needing a human can take up to 48 hours. You can request one IP every three hours.
0spam's real-time list can't be cleared by request, but it drops an IP within 24 hours of the spam stopping. Network-wide listings are rare and need 60 days without spam from the network before you can apply.
Whether a bounce says 0spam or FusionZero, Generator Labs checks your IPs against it and hundreds of other blacklists and alerts you by email, Slack, SMS, or webhook when a listing appears. Free for your first host.
Yes. FusionZero was renamed 0spam.
No. It's free with an account.
Usually about 20 minutes, up to 48 hours if it needs manual review.