> ## Documentation Index
> Fetch the complete documentation index at: https://arizeai-433a7140-claude-graphql-project-auth-check-eta8st.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Email

Optionally, you can configure an SMTP server to send transactional emails. These are used for password resets, user invitations, and more.

* **PHOENIX\_SMTP\_HOSTNAME:** The SMTP hostname to use for sending password reset emails.

* **PHOENIX\_SMTP\_PORT:** The SMTP port. Defaults to `587`.

* **PHOENIX\_SMTP\_USERNAME:** The SMTP username.

* **PHOENIX\_SMTP\_PASSWORD:** The SMTP password.

* **PHOENIX\_SMTP\_MAIL\_FROM:** The `from` address in the emails. Defaults to `noreply@arize.com`.

* **PHOENIX\_SMTP\_VALIDATE\_CERTS:** Whether to validate the SMTP server's certificate. Defaults to `true`.

Example usage:

```javascript theme={null}
export PHOENIX_SMTP_HOSTNAME="smtp.example.com"
export PHOENIX_SMTP_PORT=587
export PHOENIX_SMTP_USERNAME="phoenix-user"
export PHOENIX_SMTP_PASSWORD="yourpassword"
export PHOENIX_SMTP_MAIL_FROM="noreply@yourdomain.com"
export PHOENIX_SMTP_VALIDATE_CERTS=true
```

These settings are required for password reset flows when authentication is enabled in Phoenix.

## FAQ

<Accordion title="Which SMTP service should I use?">
  * It is recommended to use a reputable SMTP service for transactional emails to ensure delivery and prevent abuse. If you do not have a preferred service from your cloud provider, consider providers like Resend, Mailgun, Sendgrid, or Postmark, which are easy to set up and offer generous free tiers.
</Accordion>