Product Solution

Transactional Email API Built for Speed & Reliability

Deliver password resets, 2FA auth codes, payment invoices, and critical app alerts instantly. Built on a low-latency queue with sub-millisecond API response (202 Accepted).

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Transactional Pipeline Specifications

HTTP API Latency: < 50ms processing time to return 202 Accepted.
Delivery Pipeline: Automatic TLS 1.3 encryption & RSA/Ed25519 DKIM signing.
Retry Engine: Exponential backoff schedule for deferred destination MX servers.
Suppression Guardian: Automatic removal of hard bounces and spam complaints.

Why Developers Choose SendPorter's API

REST & SMTP Duality

Use our modern REST API for rich JSON metadata, or use standard SMTP relay to connect existing software without code modifications.

HMAC Webhook Delivery

Never guess if an email landed. Get instant webhooks signed with your secret key for opens, clicks, delivery, and bounce events.

Zero Spam Contamination

Every domain undergoes domain identity verification to maintain clean sending pools and protect inbox placement.

Start sending transactional emails with SendPorter

Free 2,500 emails every month. No credit card required.

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