0n3
MCP servers · email

Postmark MCP server

Transactional email — send, templates, webhooks, bounce management. Hosted by 0n3: 9 endpoints your AI can call with your own Postmark account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.

Connect PostmarkInstall into your AIWatch it work

9 endpoints4 categoriesauth: api_keyhosted

What your AI can do with Postmark

Send email · Send transactional emails3
Send an emailPOST /email
Send a batchPOST /email/batch
Send a templatePOST /email/withTemplate
Templates · Manage email templates3
List templatesGET /templates
Get a templateGET /templates/{templateId}
Create a templatePOST /templates
Bounces · Track bounces and deliverability1
List bouncesGET /bounces
More · Everything else this app exposes.2
Get delivery statsGET /deliverystats
Get a serverGET /server

Install in three steps

  1. Create a free account at 0n3.app and connect Postmark: paste a key or sign in through a door. It lands in your vault, encrypted.
  2. Open 0n3.app/install, pick your AI. A key is made for that AI alone; copy the line it gives you.
  3. Ask your AI: whoami. It answers with your connected services. Then ask it to send an email in Postmark.
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"

Connect Postmark to

Claude Code + PostmarkMCP server + skillClaude (desktop & claude.ai) + PostmarkconnectorChatGPT + Postmarkconnector · GPT actionCodex CLI + PostmarkMCP serverGemini CLI + PostmarkMCP serverCursor + PostmarkMCP serverVS Code (Copilot) + PostmarkMCP serverWindsurf + PostmarkMCP server

More email MCP servers

Resend67 endpointsGmail13 endpointsMailgun8 endpointsSendGrid5 endpoints

Questions

What can an AI do with the Postmark MCP server?

9 things: send email, templates, bounces, more. Every call runs with your own Postmark connection and lands on a receipt.

Do I need to run anything on my computer?

No. 0n3 is hosted. Connect Postmark once, install 0n3 into your AI with one line, done.

Where does my Postmark key go?

Into your 0n3 vault, encrypted, one record per connection. The AI never sees it.