authelia/docs/configuration/notifier/filesystem.md

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default	Filesystem	Notifier	Configuration	1

Filesystem

With this configuration, the message will be sent to a file. This option should only be used for testing purposes.

# Configuration of the notification system.
#
# Notifications are sent to users when they require a password reset, a U2F
# registration or a TOTP registration.
# Use only an available configuration: filesystem, smtp.
notifier:
  # You can disable the notifier startup check by setting this to true.
  disable_startup_check: false

  # For testing purpose, notifications can be sent in a file.
  filesystem:
    filename: /tmp/authelia/notification.txt