Pause sending from the domain, then confirm which list it's on with the list operator's own lookup tool. The reliable fix is to replace the domain rather than wait on a delisting. Contact support@winnr.app and the team will review the listing with you and help you move to replacement domains so your campaigns keep running. Fix whatever caused it, usually a complaint spike, a bad list, or content. Delisting is never guaranteed, and a domain that was listed for cause may not be worth recovering.
Priority order
1. Pause the domain. Sending from a blocklisted domain underperforms severely. Pause the campaigns that use it in your sending tool.
2. Confirm which list. Look the domain up on the blocklist operator's own site. Note which list it's on and any reason given.
3. Replace the domain. This is the reliable fix, and the one that gets your campaigns running again today. Contact support@winnr.app and the team will review the listing with you and help you move to replacement domains. Don't wait on a delisting to resume sending, because the outcome and the timing belong to the blocklist operator, not to Winnr.
4. Fix the underlying cause. A replacement domain sending the same volume to the same list gets listed too. Fix the cause first.
Common causes
- Spam complaints. Recipients marking your emails as spam. A rate above 0.1% is worrying; above 0.3% is dangerous.
- Bad list. Sending to invalid or scraped addresses generates bounces, complaints, and spam-trap hits. Verify lists before sending.
- Content triggers. Spammy subject lines, misleading claims, links to domains with a poor reputation, or a hard-to-find opt-out.
- Volume spike. A sudden 10x jump in send volume looks like a compromised sender.
What to send from a listed domain
Nothing. Real sends will hit spam and generate more complaints, which makes the listing stickier.
Use your other domains while the replacement is set up. If the listed domain was carrying all of your volume, pause the campaign rather than pushing it through. A paused campaign costs you a few days; a burned sender reputation costs a lot more.
Preventing future listings
- Verify lists. Use an email verification tool before every campaign.
- Monitor complaint rate. If a campaign generates complaints, stop it fast.
- Warm properly. Under-warmed mailboxes are more likely to trigger listings.
- Diversify domains. Spreading load across 5+ domains means one listing doesn't stop your campaigns.
- Check before you buy pre-warmed. Marketplace listings show a live blocklist shield, and listed domains are taken off sale. See Blocklist checks.
What's next
Frequently asked questions
How do I know my domain is listed?
The usual signs are a sudden drop in inbox placement or warming health, or bounce messages that name a blocklist. The Winnr app shows live blocklist checks for pre-warmed marketplace listings, but not for your own domains, so confirm a suspected listing with the blocklist operator's own lookup page (for example Spamhaus's domain reputation checker). Check one domain at a time rather than bulk-querying.
Which lists matter most?
Spamhaus DBL is the most widely used domain blocklist, and SURBL is also widely checked. A listing on either tends to hurt deliverability quickly. Smaller lists matter less, and some providers ignore them entirely.
How long does delisting take?
It varies by list and is never guaranteed. Some lists expire a listing on their own after a clean period; others require a request and may decline it. Because the timeline isn't in your control or ours, don't plan a campaign around it. Move to a replacement domain and treat any delisting as a bonus.
Will Winnr get my domain delisted?
Winnr can't promise a delisting on any list. The decision belongs to the blocklist operator, and a domain listed for cause may never come off. What support does is review the listing with you, advise on what triggered it, and help you move to replacement domains so campaigns keep running rather than waiting on an outcome nobody controls. Contact support@winnr.app.
What if a replacement domain gets listed too?
The underlying cause wasn't fixed. Look at what you were sending in the days leading up to the new listing. It's almost always a high complaint rate, a bad list, or a content issue.
Can I keep sending from a listed domain?
No. Messages will still hit spam and every send makes it worse. Pause campaigns on that domain and move them to replacements. Sending from your other domains continues normally.