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How to get removed from an email blacklist
Delisting is easy once the cause is fixed. Requesting removal before fixing it usually gets you listed again.
1. Confirm the listing
Note the exact IP or domain and the list name from the bounce message, for example 554 5.7.1 Service unavailable; Client host [203.0.113.25] blocked using zen.spamhaus.org. Then check the list's own lookup page; it gives the reason and the removal route.
2. Fix the cause
- Compromised account or server: reset passwords, enable MFA, check for malware or an open relay, and look for unusual outbound volume.
- Bad list practices: stop mailing purchased or old lists, remove hard bounces, use confirmed opt-in.
- Dynamic or residential IP: send through a proper relay or your provider's smarthost.
- Missing authentication or PTR: run the domain health check and fix SPF, DKIM, DMARC and reverse DNS.
3. Request removal
| List | How to delist |
|---|---|
| Spamhaus (SBL, CSS, XBL, PBL, DBL) | Use the Spamhaus IP and Domain Reputation Checker at check.spamhaus.org. PBL entries for non-mail-server IPs can be self-removed; others need the issue fixed first |
| Barracuda (BRBL) | Removal request form at barracudacentral.org; usually reviewed within a day or so |
| SpamCop | No removal form; listings expire automatically about 24 hours after reports stop |
| Microsoft (Outlook.com) | Delist portal at sender.office.com; also review data in Microsoft SNDS |
| UCEPROTECT | Level 1 listings expire automatically after 7 days without new spam. Paid express removal is optional, not required |
| Others (Mailspike, PSBL, etc.) | Follow the lookup page on each list's site |
Note: SORBS was shut down in 2024, so listings shown for it by older tools no longer matter.
4. Prevent relisting
- Watch Google Postmaster Tools and Microsoft SNDS for reputation and complaint rates.
- Keep complaint rates under 0.3%, and ideally under 0.1%.
- Rate-limit new or rarely used IPs and warm them up gradually.
- Turn on daily monitoring for your authentication records.
Frequently asked questions
Should I pay for blacklist removal?
Reputable lists like Spamhaus and Barracuda do not charge for removal. Fix the cause and use the free process.
How long does delisting take?
From minutes (self-service lists) to about a day for reviewed requests. Automatic-expiry lists clear on their own once spam stops.
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