Why list hygiene protects your sends
A dirty list quietly wrecks deliverability. Duplicate rows inflate your counts and can double-send. Malformed addresses bounce, and a high bounce rate tells inbox providers you don't look after your list — which pushes even your good mail toward spam. Cleaning before you send is the cheapest deliverability win there is.
What this cleaner does
- Normalises every address — trims stray spaces and lowercases, so Jane@… and jane@… aren't treated as two people.
- De-duplicates exact matches after normalising.
- Validates syntax and pulls out anything that isn't a real address shape.
- Flags role accounts like info@ and sales@, which you can optionally remove.
All of it happens in your browser — the list is never uploaded, which matters when you're handling other people's personal data under GDPR.
Frequently asked questions
How do I clean an email list?
Dedupe, normalise to lowercase, remove invalid syntax, and decide whether to keep role accounts. This tool does all four.
What is a role-based address?
One tied to a function, not a person — info@, admin@, sales@. Higher complaint rates, so often excluded.
Does this verify addresses are real?
No — it checks syntax and duplicates in-browser. Live MX/SMTP verification is a separate step on our roadmap.
Clean list ready? Get the message right with the subject line tester and the full pre-send checker.