http://lbrdtjaj7567ptdd4rv74lv27qhxfkraabnyphgcvptl64ijx2tijwid.onion
Assuming that a service which wants to send a notification to a user via smtp is also configured with the same issuer as oidc-push, the target email should come from said issuer and therefore can be used to map an E-Mail to a ntfy topic specifically assigned to a user. The user can login via oidc in the web interface, configure a unique topic, subscribe to that on their devices and whenever the smtp server receives an email where the user is set as recipient the mail gets...