Build or Bill

Security and privacy

Validemail.co alternatives

2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

reacherhq/check-if-email-existsCheck if an email address exists without sending any email; includes an HTTP backend (Rust).Open on GitHub FGRibreau/mailcheckerCross-language temporary (disposable/throwaway) email detection library covering many providers.Open on GitHub

What you give up either way

  • Ongoing threat intelligence and continuously updated disposable/blacklist provider lists
  • IP reputation, warm sending IPs and global infrastructure optimizations for SMTP probing at scale
  • Enterprise SLAs, anti-abuse systems and fraud signals tuned from large datasets
  • Polish of a production UI, analytics/dashboard and no-code integrations maintained by vendor

An open-source project doing the core job proves a replacement is possible. It does not prove it matches Validemail.co, and it does not prove anyone has run it for a month. How we decide.