email.settings_invalid: Application's email: or display_name: is invalid

Application's email: or display_name: is invalid.

Area 16, Built-in services; not declinable; the next step is usually the agent's.

email: { connection: from: } names the connection every email goes through, one that provides email, and the address they are from; display_name: is the application's name, written out:

example

application {    email: {        connection: main        from: "hello@notes.example"    }}

jadpo checkcheck failed: 1 error, 1 file

error connection: main sends no email

--> app.jadpo:3:21

  |3 |         connection: main  |                     ^^^^ not an email connection

reason: email: { connection: } names a connection that provides email: one with driver: Driver.smtp, or to a mail package that maps send in its provides/email.jadpo; main is a connection that sends no email, and app.jadpo declares none with driver: Driver.smtp.
next: Declare a connection with driver: Driver.smtp in connections:, and name it here (agent)
rule: email.settings_invalid
help: https://jadpo.dev/docs/errors/email.settings_invalid