Free. Open source. Runs on your machine.
Find out which emails are real. Without uploading your list.
Drop in the list you already have and OpenEnrich sorts it into safe to send, will bounce, risky and not sure, with the reason for every row. Missing the addresses entirely? It reads the company site, works out the pattern that company uses and checks each one. Nothing is uploaded: your list never leaves your computer.
One command, no signup, no API keys, no credits. AGPL-3.0 and free forever. Read the code.
What free actually gets you
Every verifier in this market is vague about its limits, so here are ours. These checks are free and reliable on any machine, and they are what kills most of the junk in a scraped list.
Proving one specific mailbox exists means asking that company's mail server, and strict servers refuse home and cloud IP addresses. When that happens OpenEnrich says not sure and tells you why, instead of inventing a verdict. That is the honest half of what ZeroBounce and NeverBounce charge you for.
If you do this at scale
Enrichment tools resell the same wholesale data APIs at a 50 to 500x markup. Add your own provider keys and OpenEnrich pays the vendors directly, only for the rows the free work missed.