Email infrastructure built for developers who ship
Slivssend is the transactional email platform for modern applications. Send at any volume, with full observability, via API or SMTP — in minutes.
3,000 emails/month free. No credit card required.
Trusted by engineering teams worldwide
From startups to public companies, thousands of development teams rely on Slivssend to deliver critical transactional emails — password resets, order confirmations, and system alerts.
Everything email. Nothing extra.
Purpose-built for transactional email. No marketing tools bloating the interface or the pricing.
Email API
RESTful API built for speed. Send transactional emails with a single HTTP call and sub-100ms confirmation.
SMTP Relay
Drop-in SMTP relay compatible with any legacy system. Full observability without touching your codebase.
Webhooks
Real-time delivery events pushed to your endpoint. Track opens, clicks, bounces, and complaints instantly.
Analytics
Per-domain and per-stream delivery analytics. Understand your email performance at every dimension.
Templates
Build and manage branded email templates with variable injection. No separate template service needed.
Deliverability
SPF, DKIM, DMARC verification, suppression management, and bounce monitoring baked in.
Send your first email in under 5 minutes
Install the SDK, configure your domain, and send. The Slivssend API is consistent, well-documented, and returns structured responses.
- Node.js, Python, Go, and REST SDKs
- Idempotent sends with message IDs
- Batch sending up to 100 recipients
- Full TypeScript types included
const { data, error } = await slivssend.emails.send({
from: "no-reply@yourapp.com",
to: "user@example.com",
subject: "Your order is confirmed",
html: "<p>Thanks for your order, <strong>Alex</strong>!</p>",
});
// Response
{
"id": "msg_01HZWXK1...",
"status": "queued",
"accepted": ["user@example.com"]
}
Real-time delivery analytics — track opens, clicks, bounces, and deliverability across all your domains.
Simple, honest pricing
Start free. Upgrade when you need more.
Free
3,000 emails/month
- REST API access
- Basic delivery analytics
- Shared IP pool
Pro
50,000 emails/month
- Full API + SMTP relay
- Webhooks (10 endpoints)
- Email templates
Scale
100,000 emails/month
- Everything in Pro
- Advanced analytics dashboard
- Dedicated IP add-on available
Enterprise
Custom volume
- SSO / SCIM provisioning
- Dedicated infrastructure
- Custom SLA guarantee