| name | send-email |
| description | Send emails via SMTP or Feishu/Lark Mail. Triggers: send email, 发邮件, email to, 发送邮件, mail, send mail. |
Send Email Skill
Overview
This skill provides the send_email tool for sending emails via SMTP or Feishu/Lark Mail. It is a standalone binary with no LLM dependencies -- pure networking only.
Usage
Call send_email with the following parameters:
- to (required, string): Recipient email address.
- subject (required, string): Email subject line.
- body (required, string): Plain text email body.
- provider (optional, string): Either
"smtp" or "feishu". If omitted, the tool auto-detects based on which environment variables are present.
- html (optional, bool): When
true, the body parameter is treated as HTML content. For SMTP this sends a multipart/alternative message with both plain text and HTML parts. For Feishu the body is sent as HTML directly.
Providers
SMTP
Sends email via any SMTP server (Gmail, Outlook, custom, etc.) using TLS.
Required environment variables:
| Variable | Description | Example |
|---|
SMTP_HOST | SMTP server hostname | smtp.gmail.com |
SMTP_PORT | SMTP server port (465 for implicit TLS, 587 for STARTTLS) | 587 |
SMTP_USERNAME | SMTP login username | user@gmail.com |
SMTP_PASSWORD | SMTP login password or app-specific password | abcdefghijklmnop |
SMTP_FROM | Sender email address | user@gmail.com |
Feishu / Lark
Sends email via the Feishu (or Lark) Open API using a tenant access token.
Required environment variables:
| Variable | Description | Example |
|---|
LARK_APP_ID | Feishu/Lark application ID | cli_a9150c716078c07e |
LARK_APP_SECRET | Feishu/Lark application secret | IrPGLtOq... |
LARK_FROM_ADDRESS | Sender email address in Feishu Mail | sender@company.com |
Optional environment variable:
| Variable | Description | Default |
|---|
LARK_REGION | Set to "global" or "lark" to use open.larksuite.com; otherwise uses open.feishu.cn | feishu |
Provider Auto-Detection
If provider is not specified in the tool call:
- If
SMTP_HOST is set, uses SMTP.
- If
LARK_APP_ID is set, uses Feishu.
- If neither is set, the tool returns an error.
Examples
Send a plain text email via SMTP
{
"to": "recipient@example.com",
"subject": "Meeting Tomorrow",
"body": "Hi, just a reminder about our meeting tomorrow at 10am."
}
Send an HTML email via Feishu
{
"to": "recipient@example.com",
"subject": "Weekly Report",
"body": "<h1>Weekly Report</h1><p>All tasks completed.</p>",
"provider": "feishu",
"html": true
}
Explicitly select SMTP provider
{
"to": "recipient@example.com",
"subject": "Hello",
"body": "Plain text content here.",
"provider": "smtp"
}
