> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apowerb.com/llms.txt
> Use this file to discover all available pages before exploring further.

# System mail

> Address verification and password reset.

These are the messages apowerb sends on its own behalf — not the mail an agent
sends through a connected mailbox, which belongs to
[Microsoft](/configuration/microsoft) or [Google](/configuration/google).

## Variables

| Variable         | Required        | Description                                                                     |
| ---------------- | --------------- | ------------------------------------------------------------------------------- |
| `SMTP_HOST`      | yes             | Relay host                                                                      |
| `SMTP_PORT`      | yes             | `587` for STARTTLS, `465` for implicit TLS                                      |
| `SMTP_FROM`      | yes             | Sender address                                                                  |
| `SMTP_USER`      | no              | Login, if the relay requires one                                                |
| `SMTP_PASSWORD`  | no              | Its password                                                                    |
| `APP_PUBLIC_URL` | yes in practice | Public URL of the **front** app: verification and reset links are built from it |

The checklist looks at the first three. A relay that needs authentication but
gets none will refuse the message at send time, not at startup.

<Note>
  Without SMTP the mailer is simply off: one log line, no error. Sign-up still
  works as long as `AUTH_EMAIL_VERIFICATION_ENABLED` is `false` — which it is by
  default. Turn verification on and the accounts of an installation with no
  relay are stuck unverified, which is why the checklist names this capability.
</Note>

## Check

Trigger a password reset from the sign-in screen and read the backend logs. A
line naming the relay means the message left; the absence of any line means no
mailer was configured.

<Warning>
  `APP_PUBLIC_URL` pointing at `localhost` produces links that work on the
  server and nowhere else — the classic « the mail arrived but the link is
  broken ».
</Warning>


## Related topics

- [Configuration](/configuration.md)
- [Introduction](/index.md)
- [Notifier Health Endpoint](/api-reference/health/notifier-health-endpoint.md)
- [Logs](/monitoring/logs.md)
- [Tools](/concepts/tools.md)