Nitrosend
Email platform operated from AI agents over MCP, covering transactional email, campaigns and automation flows.
Nitrosend is an email platform that AI agents operate through an MCP server, a REST API or a CLI. Teams connect Nitrosend to clients such as Claude, ChatGPT, Codex or Cursor, then prompt the agent to design on-brand emails, build campaigns and automation flows, and send transactional messages, with a human approving live sends.
Best for Agencies, SaaS teams and developers who already work inside an AI agent and want to run email for one or several brands from there.
- Listed in
- EmailAI Agents & Automation
- Platforms
- Web, API, MCP
- Pricing model
- Freemium
- Free plan
- Yes
- API
- Yes
- Made by
- Nitrosend USA, Inc.
- Added
Last verified: . Information taken from nitrosend.com.
What is Nitrosend?
Nitrosend is an email platform built to be driven by an AI agent instead of a dashboard. It connects to ChatGPT, Codex, Cursor, Gemini CLI, the Claude apps and other MCP-compatible clients through a first-party MCP server with 25 typed tools, and those tools cover contacts and segments, templates, campaigns, automation flows, test sends, approvals and analytics. A prompt describing an email produces a responsive, brand-matched design using the colours, fonts and logo stored in a Brand Kit, and each brand on an account keeps separate domains and audience context. Transactional messages go out through a REST API or a Node SDK on infrastructure kept apart from marketing sends. Live sends to an audience still wait for a person to confirm. Plans are priced by emails sent, with contacts unlimited on every tier.
Key Features
MCP Server
Gives agents 25 typed tools for building campaigns, flows, segments and templates, with OAuth sign-in from supported clients.
Prompted Email Design
Generates responsive, dark-mode-ready emails from a text description and applies the brand's colours, fonts and logo.
Three Email Types
Handles transactional messages, newsletter campaigns and automation flows inside one account and one API.
Multi-Brand Workspaces
Keeps a separate Brand Kit, domains, campaigns and audience context for each brand an agency or team runs.
Human Approval Gate
Requires a person to confirm delivery before an agent can send a live campaign to an audience.
Bring Your Own Keys
Routes sending through your SendGrid, Postmark, Resend, Mailgun or Amazon SES account and AI through your Anthropic or OpenAI key on paid plans.
How Nitrosend works
Connect a client
Add the Nitrosend MCP server to your agent with the command for that client and finish OAuth in the browser.
Check account status
Have the agent call the status tool, which returns account context, readiness and any blockers.
Prompt the email work
Describe the campaign, flow or transactional template you need and let the agent build it.
Approve delivery
Confirm the send when the delivery-control step asks for human sign-off.
Screenshots
Use Cases
- Onboarding Sequences
- Ask an agent to draft a multi-step welcome or onboarding flow and review it before it goes live.
- Agency Client Newsletters
- Run newsletters for several clients from one account while each keeps its own branding and domain.
- Transactional Email in an App
- Send password resets and receipts through the REST API or the Node SDK.
- Event-Triggered Flows
- Post a custom event from your application to start any flow that listens for that event name.
- Feeding Results Back to an Agent
- Pull opens, clicks and deliverability data into the agent that plans the next campaign.
Things to know
- Daily recipient limits vary
- The number of recipients allowed per rolling 24 hours depends on the plan and on sender standing, which starts lower for new accounts.
- Overage is billed per 100 emails
- On Pro and Ultra, emails beyond the plan allowance are charged at a per-100 rate, and extra AI actions are billed in a similar way.
- Email validation is a prepaid extra
- List verification is not included in any plan and must be authorised and paid for separately.
- Free plan uses smaller models
- Paid plans route AI actions through frontier models, while the free plan runs on smaller ones and shows Nitrosend branding.
FAQs
What is Nitrosend?
Nitrosend is an email platform designed to be operated by AI agents, combining transactional email, marketing campaigns and automation flows behind an MCP server and an API.
Is Nitrosend free?
Yes. Nitrosend has a free plan that starts with 8,000 emails and then allows 500 per month, with unlimited contacts and no credit card required.
How much does Nitrosend cost?
Nitrosend: a free plan is available. Paid plan rates are published on nitrosend.com. Check the official pricing page for current amounts.
Does Nitrosend have an API?
Yes. Nitrosend provides a REST API, a Node SDK, a command-line tool and an MCP server, and all of them are available on every plan including the free one.
Which AI tools work with Nitrosend?
Nitrosend connects to ChatGPT, Claude Code and Claude Desktop, Codex, Cursor, Gemini CLI, Zed, Windsurf and VS Code, plus any other client that speaks MCP.
Does Nitrosend charge per contact?
No. Nitrosend bills by the number of emails sent, and every plan stores an unlimited number of contacts.
Can an AI agent send email through Nitrosend without approval?
Not to a live audience. Nitrosend lets an agent create an account and send a first email, but its delivery-control tool requires human confirmation before audience sends.
Who makes Nitrosend?
Nitrosend is operated by Nitrosend USA, Inc., founded by George Hartley, Kam Low and Edward Hartley, who previously built the email product SmartrMail.
Who it's for
- Agencies
- SaaS teams
- Developers
- Founders
- Marketers
Comments
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