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NeschadinMCP SERVER

SendGrid MCP

Send transactional email through SendGrid with a preflight check first, manage dynamic templates, and triage deliveries — with a local webhook receiver for watching events land.

by Neschadin ↗Email: Mailboxes & DeliveryCommunity

LABSCO SUMMARY

Preflight first, and a confirm token on anything that changes settings.

Two decisions separate this from a thin API wrapper. The first is that validation is a distinct step you can run alone, and the recommended send path runs it automatically — which matters because the failure mode of email tooling is a real message to a real recipient. The second is the confirmation token on mutating console operations: an assistant cannot quietly reconfigure your domain authentication or alerts by misreading an instruction. Sending still enqueues real email, so sandbox mode is where experiments belong.

What it is

A community-maintained MCP server for Twilio SendGrid, shipped as a single compiled binary. It covers sending with validation, dynamic template management, delivery diagnostics, and account and console settings, plus an optional local receiver that captures Event Webhook traffic so you can inspect it from the same session. Contact and list marketing CRUD is deliberately out of scope.

What you get

  • A send request validated before anything is queued, and a send that runs the preflight first — sendgrid_validate_send_request, sendgrid_send_with_preflight, plus sandbox mode
  • Dynamic templates listed, created, updated and activated
  • Delivery diagnostics: Email Activity, suppressions, statistics, error classification and delivery triage
  • Event Webhook configuration inside SendGrid, plus an optional local receiver that captures events for inspection — get_received_webhook_events, get_webhook_receiver_status
  • Account and console settings: verified senders, domain authentication, mail and tracking settings, alerts and inbound parse
  • A confirmation gate on the destructive parts: mutating console tools require confirmToken: "CONFIRM" before they act
  • List and read tools that take an optional response_format of markdown or json and return pagination metadata

Requirements

A SendGrid API key with scopes covering the tools you use, and a verified sender address matching the from address you configure — SENDGRID_API_KEY and SENDGRID_FROM_EMAIL are the two required values. Optional settings cover the display name, the EU region base URL, a full base-URL override and log level. Nothing else to install: download the binary for your platform from the releases page and make it executable — it is built with bun build --compile and embeds its runtime, so end users do not install Bun. The local webhook receiver turns on only when SENDGRID_EVENT_WEBHOOK_PORT is set; for a public tunnel, require signature verification and supply the SendGrid public key. Each user runs it locally with their own key rather than sharing one hosted instance. Package sendgrid-mcp (2.0.0), MIT licensed. Email Activity may need the paid add-on on your SendGrid account.

Setup effort

Follow the published steps — chmod +x sendgrid-linux-x64

See installation options