@c4ccf608   I heard about this.

You enter the email address you signed up with, and then it sends you a one-time link you can click, and magically you are logged in.

https://support.substack.com/hc/en-us/articles/4474505704596-How-do-I-log-into-the-Substack-app-I-haven-t-received-the-login-email-link