Centralized contact collision arbiter for autonomous AI agents and multi-bot customer outreach
When independent AI agents (SDR bots, onboarding assistants, billing engines) run concurrently, they bombard the same recipient within minutes. SadaSend’s server-enforced Collision Arbiter establishes sliding-window cooldowns, priority tier preemption, and support-ticket delivery holds with 6,000 free monthly emails.
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({ apiKey: process.env.SADASEND_API_KEY! });
// 1. Query recipient cooldown status before drafting
const status = await sadasend.arbiter.cooldowns.status('alex@client.com');
if (status.ok && status.data.cooldownActive) {
console.log(`Agent hold: recipient in active cooldown until ${status.data.expiresAt}`);
// Yield execution without burning recipient trust or triggering spam complaints
process.exit(0);
}
// 2. Dispatch with server-enforced sliding cooldown and support ticket awareness
const result = await sadasend.emails.send({
from: 'growth@yourdomain.com',
to: 'alex@client.com',
subject: 'Quarterly review followup',
html: '<p>Hi Alex, here is the executive summary we discussed.</p>',
crossAgentCooldown: '24h',
priority: 'follow_up', // p0 auth, p1 support, p2 billing, p3 follow_up, p4 marketing
ticketAware: true,
});
if (!result.ok) throw new Error(result.error.message);
console.log('Dispatched message ID:', result.id);Centralized arbitration stops duplicate agent outreach across separate worker processes and independent API keys before emails leave the edge.
Engineered for high deliverability and zero incident risk
Every layer from synchronous request validation to per-key rate limits is designed to keep critical transactional dispatches fast, reliable, and contained.
Sliding-Window Recipient Cooldowns
Configure per-contact quiet periods (1h, 6h, 24h, 7d). Once any agent contacts a user, all other agents are prevented from sending until the window elapses.
Hierarchical Priority Tier Preemption
P0 Auth (password resets/OTP) and P1 Support always preempt P3 Follow-ups and P4 Marketing blasts, ensuring critical messages are never delayed.
Support-Ticket-Aware Delivery Holds
Automatically pauses automated sales and marketing outreach if the customer has an open, unresolved support ticket or billing complaint.
Sub-10ms Edge Distributed Verification
High-throughput state checking at the API gateway evaluates recipient arbitration in sub-10ms before queue insertion, preventing database locks.
SadaSend vs Uncoordinated Agents / SendGrid
Why AI development teams route multi-agent communication through SadaSend instead of uncoordinated API keys.
| Feature & Capability | SadaSend | Uncoordinated Agents / SendGrid |
|---|---|---|
| Multi-Agent Recipient Coordination | Server-enforced cooldowns | None (bots collide) |
| Open Support Ticket Pauses | Automated ticket holds | Manual suppression only |
| Priority Preemption (P0-P4) | Auth & Support override Sales | FIFO queue with zero priority |
| Edge State Latency | < 10ms lookup | Requires custom Redis cluster |
| Accidental Loop Protection | SpendGuard ($0 floor) | Uncapped billing on loop |
Verified as of November 2026. Competitor features and pricing are based on public documentation and may vary.
Start with 6,000 emails every month at zero cost
No artificial paywalls on security. Unlike providers that reserve recipient allowlists and approval workflows for enterprise tiers, every SadaSend account receives full safety controls from day one.
Everything you need to know about email collision arbiter
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.
Multi-Agent Collision Arbiter & Cooldown Engine
Prevent autonomous AI agents, sales bots, and background workers from double-emailing customers within sliding cooldown windows.
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.
AI coding agent rules (AGENTS.md, Cursor, Claude)
Setup instructions and rule files for AI coding agents: AGENTS.md, .cursorrules, CLAUDE.md, and hosted MCP configuration.
REST API Reference & Endpoints
Complete REST API reference for sending emails, managing API keys, tracking delivery events, and configuring recipient allowlists with low latency.
Why Multi-Agent Systems Bombard Customers (And How Collision Arbitration Fixes It)
An architectural walkthrough of multi-agent contact collisions, showing how to coordinate LangChain, CrewAI, and background bots with sliding-window cooldowns.
Agent Email Safety Benchmark v1.0: Testing Loop Prevention & Guardrails
When an autonomous AI agent enters an unhandled retry loop, how fast does your email infrastructure stop it? We benchmarked 5 email APIs across 10,000 failure runs.
Claude Desktop MCP Email Integration: Giving Claude Autonomous Email Capabilities
Learn how to configure Claude Desktop with SadaSend’s Model Context Protocol (MCP) server on macOS and Windows, with strict per-key safety guardrails.