Title: Email delivery Description: Configure authentication and notification email for self-hosted instances. Canonical: https://docs.openpo.st/self-hosting/email Source: [https://docs.openpo.st/self-hosting/email](https://docs.openpo.st/self-hosting/email) # Email delivery Self-hosted mode does not require email by default. Configure a transport when you need verification codes, password resets, workspace invitations, or notifications. ### SMTP ```dotenv OPENPOST_EMAIL_PROVIDER=smtp OPENPOST_SMTP_HOST=smtp.example.com OPENPOST_SMTP_PORT=587 OPENPOST_SMTP_USERNAME=mailer OPENPOST_SMTP_PASSWORD=replace-me OPENPOST_EMAIL_FROM=OpenPost OPENPOST_SMTP_TLS_MODE=starttls ``` Use port 465 with `OPENPOST_SMTP_TLS_MODE=tls` when your provider uses implicit TLS. Plaintext SMTP is rejected for non-loopback hosts. ### Resend or Cloudflare Email Set `OPENPOST_EMAIL_PROVIDER=resend` with `OPENPOST_RESEND_API_KEY` or set `OPENPOST_EMAIL_PROVIDER=cloudflare` with `OPENPOST_CLOUDFLARE_EMAIL_ACCOUNT_ID` and `OPENPOST_CLOUDFLARE_EMAIL_API_TOKEN`. Set `OPENPOST_EMAIL_FROM` to a verified sender. Set `OPENPOST_EMAIL_VERIFICATION_REQUIRED=true` only when the chosen transport is ready. Delivery callbacks, when supported, use `POST /api/v1/email/delivery/webhook` and `OPENPOST_EMAIL_DELIVERY_WEBHOOK_SECRET`. Restart after changing email configuration. Send a test invitation or password-reset email, then check the provider delivery log and OpenPost's delivery status.