DeliverySend
INFRASTRUCTURE AS CODE

Send Messages.
Deliver Instantly.

Next-generation messaging pipeline for global scale. Build transactional flows, manage notifications, and automate email delivery with a developer-first interface.

Core Infrastructure

Everything you need to scale.

Email Delivery API

High-throughput SMTP and REST endpoints designed for transactional receipts and marketing blasts.

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Global SMS Mesh

Reach customers in 220+ countries with local sender IDs and automated carrier compliance handling.

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Push Pipeline

Ultra-low latency web and mobile push notifications with custom payload support and TTL control.

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Flow Automation

Build complex logic with drag-and-drop. Chain channels based on user behavior and engagement.

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From Trigger to Terminal

Our unified pipeline ensures your message traverses the globe in milliseconds, regardless of the channel or volume.

1
Compose

Trigger API or use our Dashboard editor

2
Engine

Smart routing & compliance filtering

3
Deliver

Direct carrier & ISP peering injection

4
Insight

Real-time open & click engagement

E-Commerce

Order confirmations & real-time shipping alerts across global logistics networks

Fintech

OTP verification, fraud detection signals, and transaction lifecycle alerts

SaaS

In-app notifications, team collaboration triggers, and system status updates

Health

HIPAA-compliant appointment reminders and patient engagement workflows

One platform.
Infinite use cases.

Whether you are a solo developer building a side project or a Fortune 500 company managing millions of customer interactions, DeliverySend provides the resilient infrastructure you need to deliver critical messages at scale.

Built for Reliability at Scale

Modern communication systems fail in silence. Our infrastructure is designed to fail loudly, recover automatically, and continue delivery without human intervention.

Redundant Delivery Network

Messages are routed through multiple independent provider layers. If one channel degrades or fails, traffic is automatically shifted to backup routes without message loss.

Includes multi-region failover, provider health scoring, and adaptive retry logic.

Real-Time Processing Engine

A distributed event ingestion pipeline processes millions of events per second with sub-second latency, ensuring critical notifications are delivered instantly.

Built on asynchronous queues, load-balanced workers, and horizontally scalable compute nodes.

Smart Routing Engine

AI-assisted routing selects optimal delivery paths based on latency, cost efficiency, provider uptime, and regional compliance constraints.

Continuously optimized using real-time performance telemetry.

Observability & Monitoring

Every message is traceable from API request to final delivery. Built-in dashboards expose latency distribution, failure rates, and provider performance in real time.

Full event tracing with logs, metrics, and structured audit trails.

Automatic Retry Intelligence

Failed deliveries are not simply retried—they are re-evaluated against current network conditions, reducing duplicate failures and improving success probability.

Adaptive retry intervals based on congestion and provider responsiveness.

Enterprise Reliability Guarantees

Designed for mission-critical systems where message failure is not an option. Our infrastructure is built with redundancy-first principles across compute, routing, and provider layers.

99.99% Uptime Target Multi-Region Failover Zero Message Loss Design Real-Time Monitoring

Everything You Need to Scale Communication

From developer tooling to enterprise-grade observability, every layer of the system is designed to simplify high-volume, mission-critical message delivery.

API First

Clean, predictable REST APIs designed for fast integration, minimal setup time, and developer-first workflows.

Supports authentication, batching, and idempotent requests.

Webhook Support

Real-time event callbacks provide full lifecycle visibility—from queued to delivered, failed, or retried states.

Retry-safe delivery ensures no event duplication under network stress.

Analytics & Insights

Track delivery success rates, latency distributions, provider performance, and user engagement in real time.

Exportable dashboards and API-accessible metrics included.

Global Scale

Distributed infrastructure ensures low-latency delivery across continents with automatic regional routing.

Multi-region failover and latency-based routing included.

Rate Limiting Control

Fine-grained control over message throughput per user, API key, or workspace to prevent overload and abuse.

Template System

Pre-built and dynamic templates for emails, SMS, and in-app messages with variable injection support.

Delivery Guarantees

Built-in retry logic, fallback providers, and delivery verification ensure maximum message success rates.

Designed for Developers. Trusted by Enterprises.

Whether you're sending ten messages or ten million, the system scales predictably without additional complexity. Every feature is built to reduce operational overhead while increasing reliability.

Simple Integration Enterprise Security High Throughput Low Latency

Start building reliable communication in minutes

Join engineering teams, startups, and global enterprises that rely on DeliverySend to power mission-critical messaging systems with predictable scale and near-zero downtime.

No Credit Card Required

Start instantly with free tier access and upgrade anytime.

5-Minute Integration

Drop-in API setup designed for rapid deployment.

24/7 Infrastructure

Global systems monitored continuously for uptime assurance.

Trusted for high-volume transactional messaging across fintech, SaaS, and e-commerce systems

Simple, Scale-Ready Pricing

Pay for what you send. No hidden fees. No legacy tiers.

Sandbox
$0/mo

Perfect for prototyping and early-stage development.

  • 1,000 Messages/mo
  • Shared IP Pool
  • Standard API Access
RECOMMENDED
Pro Growth
$79/mo

Scale your business with dedicated support and analytics.

  • 100,000 Messages/mo
  • Dedicated IP Warmup
  • Priority Email Support
  • Advanced Webhooks
Enterprise
Custom

Tailored solutions for high-volume requirements.

  • Unlimited Capacity
  • 99.99% Uptime SLA
  • On-Prem Deployment

Deep Dive: Infrastructure

DeliverySend is built as a distributed messaging backbone designed for global scale, unpredictable traffic spikes, and strict delivery guarantees. Every layer is engineered for resilience, observability, and deterministic performance under load.

Multi-Region Redundancy

DeliverySend operates across 14 global regions with active-active failover. Traffic is continuously evaluated against real-time network conditions, carrier performance, and regional latency thresholds.

When degradation is detected, messages are rerouted automatically without retries at the application level—ensuring delivery continuity even during upstream provider outages.

  • • Anycast IP architecture for global routing convergence
  • • BGP-optimized path selection for minimal latency
  • • Automated regional failover with zero manual intervention
  • • Provider health scoring updated every few seconds

Intelligent Content Processing

Every message is analyzed and optimized at ingestion time. Payloads are transformed based on destination channel, device type, and regulatory constraints.

This ensures consistent rendering across fragmented ecosystems—email clients, SMS carriers, push notification systems, and embedded app surfaces.

Event Streaming Core

All message events flow through a distributed streaming backbone capable of processing millions of events per second with predictable latency.

  • • Partitioned event queues for horizontal scaling
  • • Exactly-once delivery semantics for critical workflows
  • • Backpressure handling during traffic spikes
  • • Replayable event logs for audit and debugging

System Behavior

Every request is treated as an immutable event, enabling full traceability from API ingestion to final delivery outcome.

Observability Layer

Every message is instrumented with distributed tracing, allowing engineers to inspect latency, routing decisions, and delivery outcomes in real time.

Metrics are exposed via APIs and dashboards, enabling deep insight into system behavior under production load.

Full System Observability

Visibility is not optional in distributed systems. DeliverySend provides end-to-end observability across every stage of message lifecycle execution.

  • • Real-time delivery tracing per message
  • • Latency breakdown by provider and region
  • • Failure classification and root-cause tagging
  • • Exportable logs for compliance workflows

Engineered for Predictability at Global Scale

Every subsystem is designed to eliminate uncertainty—from message routing to delivery confirmation. The result is a communication infrastructure that behaves consistently under both normal and extreme conditions.

System Overview

Welcome to the DeliverySend developer portal. This documentation provides a complete reference for integrating with our distributed messaging infrastructure, including architecture design, API usage, and security requirements.

Developer Note

All requests must be made over HTTPS (TLS 1.3+). Never expose API keys in client-side environments.

Quickstart Guide

Send your first message in under 5 minutes using our REST API.

curl -X POST https://api.deliverysend.com/v1/messages \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{"to":"+1234567890","message":"Hello World"}'

System Architecture

The platform is built on a distributed event-driven architecture designed for horizontal scalability and fault tolerance.

  • Event ingestion layer handles millions of requests per second
  • Streaming pipeline ensures real-time message propagation
  • Multi-region routing engine optimizes delivery paths

Authentication

All API requests require Bearer token authentication.

Authorization: Bearer ds_live_********************************

Rate Limits

Rate limits are enforced per account tier to ensure platform stability.

  • Standard: 500 requests/min
  • Pro: 5,000 requests/min
  • Enterprise: Adaptive dynamic scaling

Webhook Security

Webhooks are signed using HMAC-SHA256 to ensure authenticity and prevent tampering.

X-Signature: sha256=9f2c8a...

Error Handling

  • 400: Invalid request payload
  • 401: Authentication failed
  • 429: Rate limit exceeded
  • 500: Internal system error

Best Practices

  • Use exponential backoff for retries
  • Store API keys securely in environment variables
  • Validate webhook signatures before processing
  • Monitor delivery logs for anomalies

Privacy Policy

Last Updated: May 2026

This Privacy Policy describes how DeliverySend collects, uses, processes, and protects your information. We operate under a strict data-minimization and security-first architecture designed to ensure user trust and infrastructure transparency.

1. Data Collection

We collect only the minimum data required to operate a global messaging system. This includes: recipient identifiers, message routing metadata, timestamps, delivery status, and system performance logs.

Message content is not stored by default. Temporary processing may occur during transmission, after which content is discarded unless explicitly configured for archival or compliance retention by the customer.

2. Data Usage

Data is used strictly for message delivery, system optimization, debugging, and reliability improvements. We do not sell, rent, or monetize user or message data under any circumstance.

3. Security Measures

All data is encrypted in transit using TLS 1.3 and at rest using AES-256 encryption standards. Infrastructure access is restricted via hardware-backed multi-factor authentication and continuously audited.

4. Retention Policy

Metadata is retained only as long as necessary for delivery guarantees, analytics, or compliance requirements. Customers may configure custom retention rules or request full deletion at any time.

5. User Rights

You may request access, correction, or deletion of your data at any time. We comply with applicable privacy laws including GDPR and CCPA where required.

Terms of Service

Last Updated: May 2026

By accessing or using DeliverySend, you agree to be bound by these Terms of Service. These terms govern the use of our messaging infrastructure, APIs, and related services.

1. Service Usage

You may use DeliverySend only for lawful purposes and in accordance with these terms. Any abusive, malicious, or fraudulent use of the platform is strictly prohibited.

2. Account Responsibility

You are responsible for maintaining the confidentiality of your API keys and account credentials. Any activity under your credentials is considered your responsibility.

3. Service Availability

We strive to maintain high availability but do not guarantee uninterrupted service. Scheduled maintenance and unforeseen outages may occur.

4. Messaging Policy

You agree not to use the platform for spam, phishing, illegal content distribution, or any form of harassment. Violations may result in immediate suspension or termination.

5. Limitation of Liability

DeliverySend is not liable for indirect, incidental, or consequential damages arising from service usage. Our liability is limited to the maximum extent permitted by law.

Cookie Policy

Last Updated: May 2026

This Cookie Policy explains how DeliverySend uses cookies and similar technologies to operate and improve our platform.

1. What Are Cookies

Cookies are small data files stored on your device that help us maintain session state, improve performance, and remember user preferences.

2. Types of Cookies We Use

  • Essential Cookies: Required for authentication and core functionality
  • Performance Cookies: Help measure system performance and latency
  • Preference Cookies: Store UI and dashboard settings

3. What We Do NOT Use

We do not use advertising cookies, third-party tracking cookies, or cross-site behavioral profiling systems.

4. Cookie Control

You may disable cookies in your browser settings. However, some platform features may not function correctly if essential cookies are disabled.

5. Data Transparency

All cookie usage is strictly limited to operational needs. No cookie data is sold or shared with external advertisers.

Incident Response

Operational Resilience & System Integrity

DeliverySend operates a structured, multi-layer incident response system designed to detect, isolate, and resolve infrastructure anomalies with minimal service disruption.

1. Detection System

All services are continuously monitored using real-time telemetry, anomaly detection models, and synthetic traffic testing. Alerts are triggered automatically when deviations from baseline performance occur.

2. Severity Classification

  • SEV-1: Critical system outage affecting message delivery
  • SEV-2: Partial degradation in routing or API performance
  • SEV-3: Minor latency or non-critical feature disruption

3. Response Workflow

Once an incident is detected, automated systems initiate mitigation procedures including traffic rerouting, failover activation, and rate limiting adjustments. Engineers are simultaneously notified via on-call systems.

4. Communication Policy

For SEV-1 incidents, status updates are published in real time via the Global Status page. Customers receive transparent updates until full resolution is achieved.

5. Post-Incident Review

Every incident undergoes a structured postmortem analysis to identify root causes and implement system improvements.

Support

Get help with integration, billing, technical issues, or platform usage. Our support system is designed for fast resolution and engineering-level assistance.

Technical Support

API issues, webhook debugging, SDK integration, and system errors.

Billing Support

Subscription plans, invoices, usage breakdown, and payment issues.

Security Support

Report vulnerabilities, suspicious activity, or account compromise.

General Help

Documentation guidance, onboarding help, and platform navigation.

Response Time Expectations

  • Critical Issues: < 1 hour response time
  • Technical Requests: 4–12 hours
  • Billing Requests: 24 hours
  • General Inquiries: 24–48 hours