AI Plugin IndexPostmark MCP vs Harness
Postmark MCP and Harness are both ai and llm tools MCP servers. Harness scores higher (95 vs 81 out of 100). Harness has more GitHub stars (1.3k), and Harness was updated more recently (3 days ago). The table compares them side by side.
| Postmark MCP | Harness | |
|---|---|---|
| Score | 81 / 100 | 95 / 100 |
| What it does | Official Postmark MCP server for sending emails via Claude and AI assistants | Start Claude Code and Codex agents the person can watch, wait for them and read their answers. |
| Publisher | Verified: npm:@activecampaign | Verified: harness.autonomous.ai |
| Grades | Maintenance A, Licence A, Quality B | Maintenance A, Licence A, Quality A |
| npm downloads a week | 791 | Not on npm |
| Runs | Local | Local |
| Works with | Claude Code, Claude Desktop, Cursor, Codex, Gemini CLI, VS Code, Windsurf | Claude Code, Claude Desktop, Cursor, Codex, Gemini CLI, VS Code, Windsurf |
| GitHub stars | 58 | 1,320 |
| Last commit | 14 Oct 2026 | 19 Oct 2026 |
| Licence | MIT | MIT |
| Listed since | 20 Oct 2026 | 19 Oct 2026 |
| Install Postmark MCP | Install Harness |
Questions
Is Postmark MCP or Harness more popular?
Harness has more GitHub stars: 1,320.
Can I use Postmark MCP and Harness together?
Yes. AI assistants can load several MCP servers at once. Install both and the assistant picks the right one for each task.