Email validation
- https://github.com/reacherhq/check-if-email-exists#what-does-this-tool-check ↗
- https://github.com/truemail-rb ↗
- https://github.com/AfterShip/email-verifier#similar-libraries-comparison ↗
- https://github.com/devmehq/email-validator-js ↗
- https://github.com/FGRibreau/mailchecker ↗
Checks
Section titled “Checks”- Regexp
- Typo in domain
- Allow list, reject list
- Is disposable email ↗
- DNS probe ↗ (cache)
- SMTP check ↗ (cache)
- Is mailbox disabled, is full inbox
- Is Pwned ↗
- Is Catch-all address
- Listen for bounced responses and store emails in the reject list
- Is mailbox disabled, is full inbox
- Hard Bounce vs. Soft Bounce ↗