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Understand your email

Blocklist check

Check a mail server IP or domain against SpamCop, PSBL, Mailspike, DroneBL and blocklist.de. Resolve addresses automatically and see each IP’s results.

Start a check

Free diagnostics

Start a check

My history

Enter a public IPv4, mail hostname or domain. We resolve MX and IP addresses for domains. Outbound and inbound IPs may differ.

Checks that help

Is your mail server being blocked?

Blocklists contain IP addresses associated with unwanted mail or network abuse. A listing can be one reason mail is rejected. Check your server if messages start bouncing or reaching fewer recipients.

  1. 01

    Enter a server or domain

    You do not need to know the IP: enter the mail server hostname or your domain.

  2. 02

    Review the results

    We resolve the addresses and show each available blocklist’s response.

  3. 03

    Resolve the cause

    If an IP is listed, review sending activity and server security with your administrator.

Your archive

Check history

Reports are saved for 24 hours.

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General iT is here to help

Found an issue? We can help.

Find help for your task, from server configuration to website and CRM notifications.

01

Server support

Get help with your mail server, its configuration and reliable operation.

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Complete support

Website and infrastructure maintenance for issues that need a coordinated solution.

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Virtual servers

Choose resources for your project and discuss its hosting requirements.

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Learn more at your own pace

Explore articles about websites, infrastructure and running online projects on our blog.

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The bigger picture

Continue your checks

The address, server and message affect different stages of delivery. Check the parts that matter to your task.

Questions and answers

What to know

Do I need to find the IP first?

No. Enter a domain or mail hostname. Incoming and outgoing servers can differ, so use the outbound IP from your provider’s settings or a sent message’s headers when checking a sender.

Which lists are included?

SpamCop, PSBL, Mailspike, DroneBL and blocklist.de. Up to four IPv4 addresses are checked; IPv6 is not included. Any additional addresses can be checked individually.

Does this service remove blocklist entries?

No. It reports the check results. Removal follows the list owner’s process after the cause of the listing has been resolved.

How long is the result available?

Your report is available in your history for 24 hours. You can delete it earlier if you wish.

Checking IPs and domains against blocklists

Mail server blocklists help recipients assess message sources. Enter an IP, server hostname or domain: the service resolves mail servers and checks their IPv4 addresses against SpamCop, PSBL, Mailspike, DroneBL and blocklist.de. Results apply to specific addresses at the time of the request. An unavailable source is reported separately and does not count as a clean result.

What to do if an IP is blocklisted

First investigate the cause: unusual sending volume, a compromised mailbox, an infected website or another sender on a shared server. Contact your administrator or hosting provider, fix the issue and follow the relevant list’s removal process. Check again to see changes. Absence from these lists does not mean that every email provider will accept a message.