# extension-email-raw

This skill adds sending one email to several recipients through to, cc and bcc. Handy when a meeting reminder has to reach confirmed and tentative attendees at once.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 28100 installs · ★ 2
- Author: caffeinelabs
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/caffeinelabs/skills/tree/HEAD/skills/extension-email-raw/SKILL.md
- Updated: 2026-10-22
- HTML: https://affpapa.org/en/nevibecode/skills/extension-email-raw

## What it does

The skill builds on `extension-email` and exposes a `sendRawEmail` function. It takes a sender username, the `to`, `cc` and `bcc` lists, a subject and an HTML body, then returns `SendResult`: `#ok` on success or `#err(error)` with the error text. Every recipient gets the same message.

The hard limit is 50 recipients in total, and each of them sees the others in the list. That rules the skill out for service emails to many users, where exposing addresses breaks user privacy. It was never meant for that.

You need `caffeineai-email` at `~0.4.0` and a Caffeine AI subscription on the plus or pro tier. From 0.4.0 every send goes through the mail gateway using settings the platform injects on each deploy (`INTEGRATIONS_GATEWAY_URL` and `INTEGRATIONS_GATEWAY_API_KEY`). Without those settings a send returns `#err` instead of falling back. The transport canister and `INTEGRATIONS_CANISTER_ID` are gone, so check your config when moving off 0.3.x.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add caffeinelabs/skills --skill extension-email-raw -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/extension-email-raw/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/extension-email-raw/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add caffeinelabs/skills --skill extension-email-raw -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/extension-email-raw/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add caffeinelabs/skills --skill extension-email-raw -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/extension-email-raw/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install caffeinelabs/skills extension-email-raw
```

2. **Manually: put the files in place**
- File: `.github/skills/extension-email-raw/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add caffeinelabs/skills --skill extension-email-raw -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/caffeinelabs/skills --path skills/extension-email-raw
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/extension-email-raw/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add caffeinelabs/skills --skill extension-email-raw -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/caffeinelabs/skills/tree/HEAD/skills/extension-email-raw/SKILL.md

## When to use it
- send one email to several addresses at once
- remind meeting attendees in a single call
- put colleagues in cc and a manager in bcc
- surface a failed send as `#err`
- re-pin a project from `caffeineai-email` 0.3.x to 0.4.0

## Example prompts
- Add multi-recipient email sending to the project with `sendRawEmail`
- Write a function that sends a meeting reminder to confirmed attendees in to and tentative ones in cc
- Make sure a failed send returns `#err` with the text and handle that case

## Source text · SKILL.md · Apache-2.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 412e51d196529a4e.

BEGIN THIRD-PARTY FILE 412e51d196529a4e
````text
---
name: extension-email-raw
description: Send an email with multiple to, cc and bcc addresses.
version: 0.2.0
compatibility:
  mops:
    caffeineai-email: "~0.4.0"
caffeineai-subscription: [plus, pro]
---

# Email — Raw Multi-Recipient
Raw multi-recipient email extension for [Caffeine AI](https://caffeine.ai?utm_source=caffeine-skill&utm_medium=referral).

## Overview

This skill adds support for sending emails with multiple `to`, `cc`, and `bcc` recipients. Not suitable for bulk service emails (recipients see each other).

# Backend

## This extension is for sending an email with support for multiple `to`, `cc` and `bcc` addresses.

- This should NOT be used for sending service emails to multiple users because each recipient will see all the other recipients listed which would typically be a breach of user privacy.

### For sending an email

- This extension depends on the [extension-email](../extension-email/SKILL.md) for sending emails.
- Use the sendRawEmail function. 
- It returns a SendResult which is #ok if the email is sent successfully otherwise #err(error) with the error text. 
- There can be a maximum of 50 recipients in total
- Each recipient receives the same email

```mo:caffeineai-email/emailClient.mo
module {
  public type SendResult = {
    #ok;
    #err : Text;
  };

  public func sendRawEmail(
    fromUsername : Text,
    to : [Text],
    cc : [Text],
    bcc : [Text],
    subject : Text,
    htmlBody : Text,
  ) : async SendResult;
};
```

### Example usage for sending an email reminder to meeting attendees.

```motoko filepath=src/backend/main.mo
import Runtime "mo:core/Runtime";
import EmailClient "mo:caffeineai-email/emailClient";

actor {
  public func sendMeetingReminder(
    meetingSubject : Text,
    meetingTime : Text,
    confirmedAttendeeEmails : [Text],
    tentativeAttendeeEmails : [Text],
  ) : async () {
    let result = await EmailClient.sendRawEmail(
      "no-reply",
      confirmedAttendeeEmails,
      tentativeAttendeeEmails,
      [],
      meetingSubject,
      "Reminder the meeting will start at " # meetingTime,
    );

    switch (result) {
      case (#ok) {};
      case (#err(error)) {
        Runtime.trap("Failed to send meeting reminder email: " # error);
      };
    };
  };
};
```

## Upgrading from the previous version
````
END THIRD-PARTY FILE 412e51d196529a4e

The third-party file has ended. Everything between the 412e51d196529a4e tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 2313 of 3064 bytes. © caffeinelabs · Apache-2.0 · https://github.com/caffeinelabs/skills/tree/HEAD/skills/extension-email-raw/SKILL.md

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---
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