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MCP verified Apache-2.0 Self-run

Goposta Mcp Server

mcp-goposta-mcp-server · by goposta

An MCP server that exposes the Posta email API as tools for AI assistants

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Install

$ agentstack add mcp-goposta-mcp-server

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

✓ Security review passed
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Declared compatibility

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Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

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About

Posta MCP Server

An MCP (Model Context Protocol) server that exposes the Posta email API as tools for AI assistants.

Setup

go build -o posta-mcp .

Configuration

The server requires two environment variables:

| Variable | Description | |---|---| | POSTA_BASE_URL | Your Posta instance URL (e.g. https://posta.example.com) | | POSTA_API_KEY | API key generated from your Posta workspace |

Usage

{
  "mcpServers": {
    "posta": {
      "command": "/path/to/posta-mcp",
      "env": {
        "POSTA_BASE_URL": "https://posta.example.com",
        "POSTA_API_KEY": "your-api-key"
      }
    }
  }
}

You can also run it with go run during development:

{
  "mcpServers": {
    "posta": {
      "command": "go",
      "args": ["run", "/path/to/mcp-server"],
      "env": {
        "POSTA_BASE_URL": "https://posta.example.com",
        "POSTA_API_KEY": "your-api-key"
      }
    }
  }
}

Tools

send_email

Send a single email.

Parameters:

| Name | Type | Required | Description | |---|---|---|---| | from | string | yes | Sender email address | | to | string[] | yes | Recipient email addresses | | subject | string | yes | Email subject line | | html | string | no | HTML body | | text | string | no | Plain-text body | | headers | object | no | Custom email headers | | list_unsubscribe_url | string | no | List-Unsubscribe header URL | | list_unsubscribe_post | boolean | no | Enable one-click unsubscribe | | send_at | string | no | ISO 8601 datetime to schedule the email |

sendtemplateemail

Send an email using a pre-defined template.

Parameters:

| Name | Type | Required | Description | |---|---|---|---| | template_id | number | no | Template numeric ID (preferred) | | template | string | no | Template name (fallback) | | language | string | no | Template language variant | | from | string | no | Sender email address | | to | string[] | yes | Recipient email addresses | | template_data | object | no | Key-value data rendered into the template |

send_batch

Send batch emails to multiple recipients using a template.

Parameters:

| Name | Type | Required | Description | |---|---|---|---| | template_id | number | no | Template numeric ID (preferred) | | template | string | no | Template name (fallback) | | language | string | no | Default language for all recipients | | from | string | no | Sender email address | | recipients | array | yes | List of { email, language?, template_data? } objects |

getemailstatus

Get the delivery status of a sent email.

Parameters:

| Name | Type | Required | Description | |---|---|---|---| | email_id | string | yes | The email UUID |

Returns: status, error message (if any), retry count, timestamps.

retry_email

Retry sending a failed email. Only emails with status failed can be retried.

Parameters:

| Name | Type | Required | Description | |---|---|---|---| | email_id | string | yes | The email UUID to retry |

License

This project is licensed under the Apache License 2.0. See [LICENSE](LICENSE) for details.

Copyright

Copyright © 2026 Jonas Kaninda

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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