Email List Cleaner
Dedupe, validate and fix typos in a mailing list; flag role and disposable addresses.
About this tool
Addresses are picked out of whatever you paste (a raw CSV export works), lower-cased, de-duplicated and checked; obvious domain typos are fixed; role and disposable addresses are set aside with reasons. Copy the clean list or download a CSV.
What cleaning catches, and what only sending can
Lists rot: people mistype their own address at sign-up (gmial.com, hotmal.com), the same person arrives twice with different capitalisation, someone enters a ten-minute throwaway mailbox, and a batch of info@ and sales@ addresses from a scraped source will bounce or mark you as spam. Each of those has a pattern this tool can catch on your device — syntax against the address rules, a table of common typos, a list of disposable domains, the standard role prefixes — and catching them before a send protects your sender reputation, which is the thing that decides whether the good addresses reach the inbox. The honest boundary: only a mail server can say whether a mailbox exists. Paid verification services ping each domain's server to check; this tool doesn't (nothing leaves your browser), so a syntactically perfect address that was abandoned in 2019 passes. Clean here, then let bounces from the first send remove the rest. A mailing list is personal data — keep it on your device, which is the point of doing this in a browser. The CSV viewer opens the export, CSV to Excel writes it back, and the UTM builder tags the campaign links.
Frequently asked questions
Does it verify that the email exists?
No — it checks syntax, duplicates, typos and known bad patterns on your device. Existence needs a mail-server check that only sending or a paid verification service can do.
Why remove role addresses?
info@, sales@ and the like are shared inboxes that rarely opted in personally, seldom open, and are a common spam-trap source. Keep them if you know they were requested — there is a tick box.
Is my list uploaded?
No — parsing runs in your browser. The list, which is personal data, never leaves your device.
What typos does it fix?
The common misspellings of Gmail, Hotmail, Yahoo, Outlook and iCloud domains (gmial.com, yaho.com…). Each fix is listed so you can check it.