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List Detective: Free Email List Checker
Find out what's wrong with your email list. 100% Free.
Uncover hidden problems in your email list — instantly and for free. Up to 100,000 addresses — runs entirely in your browser, nothing is sent to a server. Built for email marketers who care about deliverability and sender reputation. Try now with the sample data available on the site.
Calling all curious email marketers! 🕵️
Mumme here, a marketing technologist from Stockholm — and I built List Detective because I kept seeing the same problem: email marketers uploading lists to cleaning tools without realizing they were sending their subscribers' data to a third-party server.
List Detective runs entirely in your browser. Your list never leaves your device — not a single address is sent anywhere. For anyone with compliance obligations — GDPR in particular, that matters.
It checks for invalid formats, role-based addresses (info@, noreply@, admin@), disposable domains, common typos like gmial.com, and suspicious TLDs — up to 100,000 addresses at once, instantly.
Try it with the sample data on the site to see every flag type in action before uploading your own list.
Would love your feedback — especially from email marketers who've run into deliverability issues from dirty lists. What checks would you want to see in v2?
About List Detective: Free Email List Checker on Product Hunt
“Find out what's wrong with your email list. 100% Free.”
List Detective: Free Email List Checker was submitted on Product Hunt and earned 22 upvotes and 20 comments, placing #8 on the daily leaderboard. Uncover hidden problems in your email list — instantly and for free. Up to 100,000 addresses — runs entirely in your browser, nothing is sent to a server. Built for email marketers who care about deliverability and sender reputation. Try now with the sample data available on the site.
On the analytics side, List Detective: Free Email List Checker competes within Sales, Email Marketing and Marketing — topics that collectively have 520.9k followers on Product Hunt. The dashboard above tracks how List Detective: Free Email List Checker performed against the three products that launched closest to it on the same day.
Who hunted List Detective: Free Email List Checker?
List Detective: Free Email List Checker was hunted by Mumme Fanaei. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of List Detective: Free Email List Checker including community comment highlights and product details, visit the product overview.
Mumme Fanaei