EmailListCleaner.org is a privacy-first, free and open source email list validator.
This is a free and open source, privacy-first email address list validation tool where the processing happens inside your own browser and no one, including myself, get access to your email addresses. It's all open source, so you don't need to trust my word that this is how it works, you can verify exactly how it works.
Some of its other key features:
Validate a list of email addresses.
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