| Breachchecker.com | history of data leaks associated with a particular email address |
| Metric Sparrow email permulator | |
| snov.io email finder | find emails of company employees by domain name. |
| Mailfoguess | tool create a lot of possible local-part from personal information, add domain to all local-part respecting the conditions of creation of mail of these domains and verify these mails |
| Hunter.io | can link to an article to find its author and his email address |
| Mailcat | find existing email addresses by nickname in 22 providers, > 60 domains and > 100 aliases |
| H8mail | email OSINT and breach hunting tool using different breach and reconnaissance services, or local breaches such as Troy Hunt’s “Collection1” and the infamous “Breach Compilation” torrent |
| MailBoxLayer API | free api for email adress checking |
| EmailHippo | Simple free online tool for check the existence of a particular email address and evaluate its reliability on a 10-point scale. |
| Spycloud.com | check for a particular email in data leaks. Shows how many addresses registered on a particular house have been scrambled |
| Gravatar check | Just enter email and see what the person’s Gravatar avatar looks like. |
