The transactional email API built specifically for SaaS from MVP to millions of users
Power user onboarding, magic links, Stripe billing receipts, security alerts, and autonomous AI agents from a single unified API. 100% DKIM signing, low latency, and 6,000 free sends every month.
Drop into your application in under 60 seconds
Native typed interfaces with zero unnecessary dependencies. Built for standard fetch and modern edge runtimes.
import { SadaSend } from 'sadasend';
const sadasend = new SadaSend(process.env.SADASEND_API_KEY!);
// Unified SaaS email dispatch for authentication, billing, or alerts
export async function sendSaasNotification(params: {
to: string;
type: 'welcome' | 'invoice' | 'alert';
subject: string;
html: string;
}) {
return await sadasend.emails.send({
from: 'Platform <noreply@yourdomain.com>',
to: params.to,
subject: params.subject,
html: params.html,
tags: [params.type, 'saas-core']
});
}Unified SaaS transactional email pipeline handling onboarding, billing receipts, and security notices with clean tag categorization.
Engineered for high deliverability and zero incident risk
Every layer from edge connection pooling to per-key rate limits is designed to keep critical transactional dispatches fast, reliable, and contained.
Unified SaaS Communication Pipeline
Manage magic links, password resets, onboarding emails, invoice receipts, and notification digests through one clean API.
Native AI Agent Tool Calling
Equip autonomous coding and customer service AI agents with safe email capabilities via 10 hosted Model Context Protocol tools.
Pre-Warmed Reputation Pools
New SaaS projects get instant high deliverability on pre-warmed IP pools without waiting weeks for manual IP warm-up.
Staging Sandbox & Allowlists
Protect development environments from emailing real customers by applying recipient allowlists to test API keys.
Multi-Tenant Domain Management
Easily verify multiple corporate domains and subdomains from a single dashboard with automated DNS instructions.
6,000 Free Monthly Sends
Launch your SaaS MVP at zero cost with full API features, custom domain DKIM, and webhook monitoring included.
SadaSend vs Legacy Developer Email Providers
Why modern SaaS founders choose SadaSend over legacy providers with complex setups and outdated developer tools.
| Feature & Capability | SadaSend | Legacy Developer Email Providers |
|---|---|---|
| Native AI Agent Guardrails & MCP | None (Basic REST API only) | |
| Dedicated IP Surcharges | $0 (Smart pools included) | $89.95/month extra per IP |
| Synchronous API Error Feedback | Silent drops with 202 Accepted | |
| Staging Recipient Allowlists | ||
| React Email Template Support | ||
| Permanent Free Tier with DKIM | 6,000 sends forever | Trial expiration or 100/day limit |
Start with 3,000 emails every month at zero cost
No artificial paywalls on security. Unlike legacy providers that reserve recipient allowlists or dedicated IP pools for high enterprise tiers, every SadaSend account receives full safety controls from day one.
Everything you need to know about SaaS email API
Clear, transparent answers on deliverability, API authentication, and rate limits.
Related developer guides and architectural tutorials
Explore step-by-step production implementation blueprints, benchmarks, and protocols.
REST API Reference & Endpoints
Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.
Model Context Protocol (MCP) Server
Connect AI agents directly to SadaSend via Model Context Protocol (MCP). Inspect tools, configure execution scopes, and enable human approval holds.
Micro-SaaS Stack: Supabase, Stripe & SadaSend Guide
Building a SaaS in 2026? Here is how to architect authentication with Supabase, payments with Stripe, and transactional delivery with SadaSend with zero rate limits.
Email Threat Modeling for SaaS: Preventing Compromised API Key Abuse
What happens when an engineer accidentally commits an email API key to a public GitHub repo? Here is the threat model and defense blueprint.
Why your transactional email goes to spam
People assume transactional mail is exempt from filtering because it was requested. Mailbox providers do not know that, and mostly do not care.
Gmail, Yahoo and Microsoft now reject non-compliant mail. The 2026 checklist
The consequence changed. Non-compliant mail used to land in spam, where you might eventually notice. It is now refused at the door.