Email Click Tracking for Campaigns
If you run experiments and want clean numbers back, email click tracking for campaigns is the difference between guessing and knowing. marginal handles the sends, captures opens and clicks, and reports lift inside the test — all through tools your AI agent can call directly.
What click tracking gives you per campaign
When marginal manages a send, it instruments each message so you get open and click data attributed back to the specific variant and recipient cohort. That means your reporting is scoped to the campaign and the test, not blended into a vague account-wide dashboard.
Because tracking is built into the managed send, there's no separate pixel setup or link-rewriting step for you to maintain. You launch a test, and the metrics come back structured.
- Open and click tracking on every managed send
- Metrics tied to each subject line A/B test variant
- Within-test lift so you can compare arms directly
- Results retrievable on demand via get_results
Pairing click data with subject line A/B tests
Click tracking is most useful when it's attached to a comparison. With marginal you generate candidate subject lines, launch them as a subject line A/B test, and then read back not just opens but downstream clicks for each variant.
That lets you answer the question that actually matters: which subject line drove engagement past the inbox, not just which one got opened. The lift metric quantifies the gap between variants within the same test.
- generate_variants — draft subject line candidates
- launch_test — send the variants with tracking enabled
- get_results — pull open, click, and lift figures
- recommend_next — get a data-backed next move
Running it through an AI agent
marginal is a hosted email MCP server, so AI agent email marketing workflows can call these tools without you standing up infrastructure. Connect a client like Cursor, Claude Desktop, Claude Code, Windsurf, Cline, Continue, Codex, or Zed to https://marginal.sh/mcp and authenticate with a Bearer API key.
From there your agent can describe a campaign goal, spin up a test, and interpret the click numbers automatically — closing the loop from idea to measured result without you switching tools.
- Hosted endpoint: https://marginal.sh/mcp
- Auth with a marg_live_ Bearer key
- Free tier covers 100 experiments per month
- Docs and tool reference at https://marginal.sh/docs/
Get started with marginal
marginal is a hosted email marketing MCP server at marginal.sh. Sign up free, create an API key, and connect https://marginal.sh/mcp from Cursor, Codex, or Claude Desktop.
- 100 experiments/month on the free tier
- Four MCP tools: generate_variants, launch_test, get_results, recommend_next
- Listed in the MCP Registry as sh.marginal/mcp