What Is a Transactional Email API? (Explained for Founders)
Password resets, receipts, and alerts — how HTTPS email APIs work, why they beat SMTP in apps, and how OquMail includes one on the free plan. Learn…
A transactional email API lets your application send email with an HTTPS request instead of opening an SMTP connection. Your backend posts JSON — to, subject, body — and the provider handles delivery, retries, and authentication.
Quick summary
- Account verification and password reset codes
- Order receipts and shipping notifications
- Billing invoices and payment failures
- Team invites and role changes
- Monitoring alerts from your infrastructure
Typical use cases
- Account verification and password reset codes
- Order receipts and shipping notifications
- Billing invoices and payment failures
- Team invites and role changes
- Monitoring alerts from your infrastructure
OquMail API basics
Create an API key per mailbox in the admin panel. POST to /api/v1/emails with Bearer auth. Messages send from your verified domain with DKIM, appear in delivery logs, and can be marked no-reply to block responses.
Common questions
How long does what is a transactional email api? take for a small business?
Most teams finish domain connection and first mailboxes in under an hour. DNS propagation is often minutes; in rare cases wait up to 24–48 hours. OquMail shows live verification so you know when you are ready.
Do I need technical experience to set up business email?
No. If you can log into where you bought your domain and paste a few lines of text, you can set up professional email. OquMail guides you step by step and verifies when DNS is correct.
Can my small team use business email for free?
Yes. OquMail's free plan includes up to 15 mailboxes on your own domain with webmail, guided SPF/DKIM/DMARC setup, and a transactional email API — no credit card required.