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Sendsets is an outbound API and platform designed to allow AI agents, CLI clients, MCP clients, and developer applications to execute and manage cold email campaigns.
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Evidence-backed listing facts
Only known values with retained provenance are shown. Missing fields are omitted instead of being filled with guesses.
- Pricing Verified
- Freemium
Evidence: Free for 10 mailboxes
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- MCP support Verified
- Native
Evidence: Run cold email from Claude Code, Codex, or any MCP client.
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- API Verified
- Public API
Evidence: The SendSets API lets you drive everything you can do in the dashboard programmatically: mailboxes, campaigns, contacts, the unibox, and more.
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- Human approval Verified
- Optional
Evidence: Ask before any paid mailbox order, test send, or live launch.
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Reviewed sources
These sources were reachable when the listing evidence was checked.
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About Sendsets
Sendsets is an outbound API and platform designed to allow AI agents, CLI clients, MCP clients, and developer applications to execute and manage cold email campaigns.
Evidence: Sendsets is a cold email platform built to be operated from AI agents and code. Create campaigns, connect mailboxes, send email, manage replies, and plug outbound into your product through…
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The platform enables AI agents and developer workflows to programmatically create campaigns, connect or provision mailboxes, rotate senders, handle replies, and trigger follow-ups from product events.
Evidence: The outbound API to create campaigns, connect mailboxes, send cold email, and manage replies from Claude, Codex, MCP, CLI, or your own code.
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Capabilities
Provides direct integration for MCP clients, Claude Code, Codex, CLI, and typed SDKs in JavaScript, TypeScript, Python, and Go.
Evidence: Run cold email from Claude Code, Codex, or any MCP client.
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Allows connecting existing Google, Microsoft, or SMTP/IMAP inboxes, as well as provisioning dedicated outbound mailboxes.
Evidence: Connect your own inboxes or provision new ones.
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Includes automated reply handling with unified inbox features, reply classification, and automatic stop-on-reply actions.
Evidence: Automatically stop follow-ups when someone responds.
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Supports product-event-triggered follow-ups using webhooks and custom API events.
Evidence: Let product activity trigger or change outbound.
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Use cases
Executing outbound campaigns directly from developer coding agents such as Claude Code or Codex.
Evidence: Run cold email from Claude Code, Codex, or any MCP client.
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Triggering customized cold email sequences based on GitHub release changes or competitor monitoring data.
Evidence: when a company ships an SDK or API update we have Claude read the changelog, figure out what integration they’re probably trying to enable, then send them a tiny working example using our…
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Who Sendsets fits — and what to check
Decision guidance below is tied to the cited evidence. Treat observed third-party claims as leads, not product guarantees.
Best for
Developers and AI agent workflows looking to operate cold email programs via code, CLI, or MCP tools without relying on manual campaign builders.
Evidence: The outbound layer that lets AI agents launch and operate cold email.
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Method: ClawSites keeps discovery copy separate from publishable claims, retains a source excerpt, and displays the date each cited source was checked. Pricing and availability can still change after that date.
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