Authentication

How to obtain and use your turboSMTP API key.

Get an API key

1. Register or log in to your turboSMTP account.
2. Open Settings → Integrations and create an API key.
3. Copy the key — you will not be able to see it again.

Use the key

Pass the key as a Bearer token on every request:

curl https://api.turbo-smtp.com/mail/send \
  -H "Authorization: Bearer $TURBO_SMTP_KEY"

Keep your key server-side. Never ship it in client-side code or commit it to version control.

Rate limits

Limits depend on your plan. A 429 response means you have exceeded your current send rate — back off and retry with exponential delay.