Email Blacklist Matcher

The Email Blacklist Matcher screens a list of email addresses against a blacklist that can contain both specific addresses and whole domains. Paste the list you want to check into the first box and your blacklist into the second, and the tool identifies every address that matches, telling you whether it was blocked because of the exact email or because its domain is on the list.

This is exactly what you need for enforcing suppression rules, blocking known spam traps or competitors, and keeping problematic domains out of your campaigns. Because the blacklist accepts domains as well as full addresses, you can block an entire company or free provider with a single entry rather than listing every mailbox individually. A statistics panel summarises how many addresses were checked, matched, and left clean.

Everything runs locally in your browser using JavaScript, so neither the list nor the blacklist is uploaded or stored. By default the tool reports matches in a table with the reason for each, which is useful for auditing, but you can switch on the remove option to instead output the clean list with every blacklisted address stripped out, ready to send.

Features

• Screens a full email list against a blacklist that can mix specific addresses and entire domains together.
• Blocks a whole company or free provider with a single domain entry instead of listing every mailbox.
• Reports each match in a table alongside the reason, showing whether the email or its domain was blacklisted.
• Offers a remove mode that instead outputs the clean list with every blacklisted address stripped out.
• Matches addresses and domains case-insensitively so capitalisation never lets a blacklisted entry through.
• Shows a live statistics panel counting the addresses checked, the matches found, and the clean remainder.
• Runs entirely in your browser so both your list and your blacklist stay private on your own device.

How to use Email Blacklist Matcher

1. Paste the email list you want to screen into the first input box on the left.
2. Paste your blacklist into the second box, mixing full email addresses and bare domains as needed.
3. Leave the remove option off to see a table of matches, or turn it on to output the cleaned list.
4. Click the Match blacklist button to screen every address against your blacklist entries.
5. Review the match table with reasons, or the cleaned list, then check the statistics panel for totals.
6. Copy or export the results so you can act on the matches or import the cleaned list elsewhere.

Benefits

• Enforces suppression and blocking rules reliably so unwanted contacts never slip into a send.
• Blocks entire domains at once, which is far faster than adding every individual mailbox by hand.
• Provides an auditable table of matches with reasons, useful for compliance and internal review.
• Cleans a list in one step with the remove mode so you get a send-ready output immediately.
• Avoids mistakes because domain and address matching are both handled case-insensitively.
• Keeps sensitive lists and blacklists private since everything is processed locally with no uploads.

A blacklist entry is treated as a domain unless it contains an at sign, in which case it is treated as a specific address. That means example.com blocks every mailbox at that domain, while user@example.com blocks only that one person. You can freely mix both styles in the blacklist box, separating entries with new lines, commas, semicolons, or spaces, and a leading at sign on a domain is handled gracefully.

In the default table mode the Reason column tells you whether each match was caught by an exact email rule or a domain rule, which is helpful when you are auditing why something was blocked. Switching on the remove option changes the output to the surviving clean list instead, so you can move straight from screening to sending without a second tool. The statistics panel updates to match whichever mode you use.

All screening happens with JavaScript in your browser, so neither your list nor your blacklist is ever transmitted or saved, keeping the tool safe for confidential suppression data. To go further with list hygiene, pair it with the Email Whitelist Filter for the opposite approach of allowing only approved senders, or the Disposable Email Domain Checker to catch throwaway addresses.