How do I connect an AI assistant to SendFox?

Connect SendFox to Claude, ChatGPT, or Codex and run your email marketing by chatting — add contacts, draft and send emails, and check results in plain English.

What the SendFox MCP is

MCP (Model Context Protocol) is a standard way for an AI assistant to talk to another product. The SendFox MCP server gives your assistant a direct, authenticated connection to your SendFox account, so instead of clicking through the app you can just ask.

Once connected you can, for example:

• Add contacts, tag them, and pull someone's activity
• Create and manage lists
• Draft an email, set its audience, and send it
• Build and edit automations
• Ask how a campaign performed

Your assistant acts as you. It can only reach the account you sign in with, and only do things your plan allows.

Before you start

• You need a Pro or Empire plan. The MCP server is part of the monthly plan, and it also works during a trial.
• This is not the same as API access. A Lifetime plan includes the SendFox REST API but not the AI assistant connection. The Free plan includes neither.
• Access is checked on every request, so if your plan changes the connection follows it straight away — a connection you set up earlier will not keep working after a downgrade.

Everything below starts from sendfox.com/developer/mcp, which shows your connection URL. It is the same URL for every assistant: https://sendfox.com/mcp

Connect your assistant

Claude (web and desktop)

1. In Claude, open Settings → Connectors → Add custom connector.
2. Paste the connection URL and save.
3. Claude opens a SendFox sign-in page — approve it and you're connected.

Claude Code (CLI)

Add the server with one command:

claude mcp add --transport http sendfox https://sendfox.com/mcp

Or add it to your project's .mcp.json. Then run /mcp inside Claude Code to sign in and authorize SendFox.

ChatGPT

1. Open Settings → Connectors → Add and choose a custom connector.
2. Paste the connection URL.
3. Sign in and authorize SendFox when prompted.

Building on the OpenAI API instead? You can add SendFox as an MCP tool on a Responses request — the developer page shows the exact JSON.

Codex (CLI)

Add the server to ~/.codex/config.toml under [mcp_servers.sendfox] — the developer page shows the exact block to paste. Start Codex and it opens a browser to sign in and authorize SendFox.

Troubleshooting

I get an error saying the MCP server requires Pro

• The full message is "The SendFox MCP server is available on Pro plans. Upgrade to connect your AI assistant." It means the account you signed in with is not on a monthly plan.
• A Lifetime plan will hit this even though the REST API works — they are separate features.
• If you are on a trial it should work; check you signed in with the right SendFox account.

It worked before and now it doesn't

• Access is re-checked on every request. If the plan was cancelled, downgraded, or a trial ended, the connection stops working immediately — reconnecting won't help until the plan is active again.
• If your account is paused or restricted, that also blocks the connection. See why an account gets paused or restricted.

The sign-in step doesn't finish

• Your assistant opens a SendFox page to authorize the connection. If it never appears, check for a blocked pop-up, then start the connection again.
• Make sure you're signed in to the SendFox account you actually want to connect — the assistant gets whatever account approves the request.

My assistant says it can't do something

• Plan limits still apply. Anything you cannot do in the app — exceed your contact cap, send past your monthly allowance — the assistant cannot do either.
• Ask it to be specific about the error it received; it is passing SendFox's own response back to you.

Still stuck? Reach us through the SendFox Help Center.

Frequently asked questions

Which plans include it?

Pro and Empire, including during a trial. Lifetime and Free do not — though Lifetime does include the REST API, which is a different thing.

How is this different from the API?

The REST API is for code you write yourself. The MCP server is for an AI assistant to use on your behalf, in conversation. They are separate surfaces with separate plan requirements.

Can my assistant send an email without asking me?

It can send, because sending is one of the things the connection allows. Assistants generally confirm before taking an action like that, but treat the connection as having the same reach as your own login — if you would not want something done unprompted, say so in your instructions.

Can I connect more than one assistant?

Yes. The connection URL is the same for all of them, and each one signs in separately.

How do I disconnect?

Remove the connector in your assistant's settings. You can also revoke the connection from Settings → API tokens in SendFox, which cuts off access immediately.