Truncus is the email execution layer for SaaS teams who can't afford silent failures. send_sync confirms the receiving mail server accepted each password reset and invoice — or hands you the exact error, fast.
Your user resets their password. You send the email through your email API. You get a 200 OK. But did the mail server actually accept it? You don't know. Your user waits. Refreshes. Opens a support ticket. You check logs — “sent” but no delivery confirmation.
With Truncus, your code knows the receiving mail server accepted the email before you move on — or gets the exact error if it didn't.
// Before (any other email API)
await resend.emails.send({ to, subject, html });
// Returns: { id: "msg_xxx" }
// Did it go through? No idea.
// After (Truncus)
const result = await truncus.emails.sendSync({ to, subject, html });
// Returns: { status: "delivered", latency_ms: 1040 }
// "delivered" = the receiving mail server accepted it. You KNOW.Delivery confirmation in 1 second. Not "check your webhook later."
AWS SES in Ireland (eu-west-1). Circuit breakers detect failures fast and surface the exact error — no silent failures.
Failed sends enter a durable retry queue (30s/2m/8m/30m/2h backoff). Dead-letter recovery. Replay API.
Sending from Ireland, email data stored in Frankfurt. GDPR-native. No add-on needed.
Don't waste sends on bouncing addresses. Confidence scoring.
Every send logged with its outcome. Provider health API for monitoring.
Switching from your current email API? Truncus speaks the same language.
// Most email APIs
await emailApi.send({ from, to, subject, html });
// Returns 200 OK... but did the mail server accept it? You don't know.
// Truncus — synchronous delivery confirmation
import { Truncus } from '@truncus/email';
const truncus = new Truncus({ apiKey: 'tr_live_...' });
const result = await truncus.emails.sendSync({ from, to, subject, html });
// result.status = "delivered", result.latency_ms = 1040Same request shape. Better outcome. Migration takes 15 minutes.
All plans include send_sync, batch API, scheduled sends, and sandbox mode.
Free
$0
3,000 emails/month
For testing and dev
Pro
$19/mo
50,000 emails/month
For shipping products
Scale
$99/mo
300,000 emails/month
For serious infrastructure
Free tier. 3,000 emails/month. No credit card. Same request shape, better outcome.
Start free