How to communicate professionally with blocklist maintainers?

You've checked your delivery rates, something looks wrong, and then you find it: your domain or IP is on a blocklist. Now you need to reach out to the operator. What you say (and how you say it) matters more than most people realise.

Blocklist maintainers are not customer support teams. They're mostly volunteers or small teams fighting spam on behalf of the whole email ecosystem. They field dozens of requests a day, many from senders who dodge accountability and push blame onto third parties. The ones who stand out are the ones who don't do that.

What to include in your message

Lead with the facts, not the feelings. Give them your domain or IP, the blocklist name, and when you noticed the issue. No lengthy backstory, no drama. Just the specifics they need to pull up your listing.

Explain what caused the listing. Be honest. If it was a compromised account, say so. If you inherited a stale list and sent to contacts who hadn't heard from you in years, say that too. Operators have seen every version of "I have no idea why I'm listed." They know when someone is being evasive.

Tell them what you fixed. This is the most important part. Not what you plan to fix, what you already fixed. Locked down the compromised account? Mention it. Reset credentials and enabled two-factor authentication? Say so. Cleaned the list and removed unengaged contacts? Include it. The fix is your proof that the problem won't repeat.

Ask clearly and politely for a review. One ask. Don't demand, don't threaten, don't hint at legal action. A simple "I'd appreciate a review of the listing when you have a chance" is enough.

A rough template to adapt

"Hi, my domain [yourdomain.com] / IP [x.x.x.x] appears to be listed with [blocklist name]. I noticed this on [date] when [brief symptom, e.g. delivery failures to specific providers]. After investigating, I found [root cause]. I've since [specific fix]. I'd appreciate a review of the listing when possible. Happy to provide any additional detail you need."

That's it. Short, clear, complete.

What to avoid

• Don't blame your ESP, your list provider, or a rogue employee as a deflection. Even if it's partly true, you're responsible for your infrastructure. Own it.
• Don't follow up repeatedly if they don't respond quickly. Some blocklist operators like Spamhaus have formal processes with specific timelines. Follow them.
• Don't CC multiple people inside their organisation trying to escalate. It signals bad faith and often slows things down.
• Don't promise future fixes you haven't done yet. If the problem isn't fixed, don't request delisting. You'll just end up back on the list, and your credibility takes a hit.

One thing most senders miss

Before you contact anyone, make sure you've actually read that blocklist's delisting policy. Some are automated and require nothing from you beyond visiting a form. Others want a full written explanation. SORBS and Barracuda, for example, have their own distinct processes. Sending a polished email to an inbox that nobody monitors is wasted effort.

Not sure if you're actually listed anywhere right now? Run a quick check with our free blocklist checker before you do anything else. If you're mid-crisis and things are moving fast, our SOS hotline is free and we'll actually help you draft the message.