Looking for logging into the Email Auth site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Email Auth site. After that you can login as usual with your login credentials.
https://firebase.google.com/docs/auth/web/password-auth?hl=es-419
https://firebase.google.com/docs/auth/web/email-link-auth?hl=es-419
http://www.samlogic.net/articles/smtp-commands-reference-auth.htm
https://wordpress.org/plugins/email-login-auth/
https://www.ndchost.com/wiki/mail/test-smtp-auth-telnet
https://docs.mongodb.com/stitch/authentication/userpass/
https://auth0.com/passwordless
https://auth0.com/docs/connections/passwordless
https://laravel.com/docs/5.7/authentication
https://tutsforweb.com/laravel-auth-login-email-username-one-field/
https://stackoverflow.com/questions/37467492/how-to-provide-user-login-with-a-username-and-not-an-email
https://developers.google.com/gmail/api/auth/about-auth
https://developers.google.com/+/web/api/rest/oauth