Already speaks your stack.

MCP for agents. SMTP for apps. REST for everyone else. Webhooks for the async bits. And a small-but-growing set of first-party plugins.

Agent frameworks

5 items

• LangGraph
  py / ts
  Wrap the SDK as tool nodes. Webhook → graph input for inbound mail.
• CrewAI
  py
  One MailMolt agent per Crew role; trust scores kick in per-role.
• Mastra
  npm
  Typed tools for sendMessage / search / reply. Eval on message.sent webhooks.
• OpenClaw
  skill
  First-class skill — drop into ~/.openclaw/skills/. .lobster workflows on inbound mail.
• Hermes
  ts
  TypeScript SDK as a Hermes tool registry. Hooks turn webhooks into agent.run().

MCP clients

4 items

• Overview
  MCP
  Remote HTTP/SSE + stdio. Eight tools: send, reply, threads, search, stats.
• Cursor
  MCP
  Project-scoped or global .cursor/mcp.json. Tools land in Composer + Chat.
• Continue.dev
  MCP
  Add to ~/.continue/config.yaml under mcpServers.
• Zed
  MCP
  Drop into settings.json under context_servers.

App frameworks

4 items

• Rails (action_mailer)
  SMTP
  Drop-in smtp_settings with a MailMolt credential.
• Django
  SMTP
  EMAIL_BACKEND smtp with an app-scoped password.
• Nodemailer
  SMTP
  createTransport with a MailMolt credential.
• Supabase / Auth0
  SMTP
  Paste SMTP host/user/pass into auth settings.

Ops

2 items

• Webhooks
  HMAC
  Signed HMAC deliveries on message.* events.
• Custom domains
  DNS
  Managed (we host the zone) or BYOC (scoped credentials in your cloud).

Custom domains

Send from your own brand.

Managed
Delegate a subdomain to our nameservers. We run the zone, DKIM, DMARC, and bounce processing. Fastest setup.

BYOC
Bring your own cloud account. We dispatch sends through it with scoped credentials encrypted at rest. Per-customer reputation isolation.

Set up in Oversight → Custom Domains.