OAuth-scoped to one workspace
An MCP connection is pinned to the workspace you authorized. No way for a connected client to leak across tenants; no 'guess the first workspace' fallback.
AI / MCP
Bring your own AI — exactly when you want it
Connect Claude Code, Cursor, or Codex over MCP. The AI client drafts; Mailbase saves it as a draft. Nothing sends until a teammate clicks send.
Mailbase ships a 28-tool MCP server with OAuth-scoped workspace binding. Your AI client lists pending tasks, completes them with structured results (draft reply, generated variants, report, classification, contact enrichment), and Mailbase mirrors AI-written variants into a draft A/B campaign automatically. AI-created records carry a distinct "AI" badge so you always know who wrote what.
Tasks with structured results
AI clients pick up pending tasks (replies to draft, variants to generate, classifications to do) and submit typed results. Mailbase normalizes them so the review UI is always predictable.
Drafts, never auto-send
AI output is always a draft. Variants land on the A/B tests page as a draft campaign; replies land in the review queue. A human approves before anything sends.
What it ships with
- 28 MCP tools across replies, campaigns, audiences, templates, contacts, analytics
- Result schemas: draft_reply, generated_variants, report, classification, contact_enrichment
- Generated variants auto-mirror into a draft A/B campaign so they're visible immediately
- AI-created records get an "AI" badge in lists
- Works with Claude Code, Cursor, Codex, and any MCP-spec client
Try it in your workspace.
Free to start. No credit card. Self-hosted or managed sending.
Start free