How to check your domain for blocklists

See whether your domain or sending IP is on a blocklist, get alerted when it happens, and find the removal form

Updated 11 October 2026

A blocklist is a public list of domains and addresses that have sent spam. Gmail, Outlook and Yahoo check a few of them on every message, so a listing sends everything you send to spam until you are removed. SpamCipher checks your domain against the 36 lists that matter, keeps checking on a schedule, and emails you the moment a listing appears, with a link to that list's removal form.

Note: What it costs: blocklist monitoring uses slots. SpamCipher ONE includes 10, shared between domains and IPs. A workspace without ONE adds slots from Plan & Usage.

Note: Only the lists that affect delivery. Hundreds of blocklists exist and most are ignored by every mail provider. Being on one of those changes nothing; being on Spamhaus or Barracuda changes everything.

Before you start

The domain your mailboxes send from
About 4 minutes

Monitor a domain

Step 1: Open Blacklists

Open Plan & Usage at the top right and click Manage Blacklist & IP under Monitoring, or go to the Blacklists page under Deliverability.

Step 2: Add the domain

Type the domain, or pick one of your sending domains from the list next to the box.
Add an alert email if you want the alert sent somewhere other than your account's address.
Click Monitor domain. SpamCipher checks it against every list right away, then every six hours.

Step 3: Read the result

Each monitored domain is listed with its state: clear, or listed with the name of each list it is on.
A listing shows a Delist link to that list's own removal form. Most lists remove a domain within a day of a request once the cause is fixed.

Monitor a sending IP

Step 4: Add an IP address

If you send from a dedicated IP, add it under Sending IP addresses so it is checked the same way. Give it a label you will recognise.
Click Monitor IP.

Troubleshooting

Monitor domain says I have no slots left

Every monitored domain and IP takes one slot. Remove one you no longer need, or add slots on Plan & Usage under Blacklist & IP.

My domain is listed but my emails still arrive

Some lists are not used by the big providers, and the page says which ones matter. A listing on a minor list is worth clearing when you have time, not an emergency.

I was removed and listed again a week later

The cause is still there. Check for bounces (a list that was not verified), complaints (people marking you as spam) and a mailbox sending far more than its warm-up allows, then request removal again.

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