Questions · Published 2026-09-29 · Updated 2026-09-29 · AgentiSend
Which email APIs have a hosted MCP server?
A few email APIs publish an MCP server an agent can call. This table lists the hosted URL, whether it is official, the tool count, the auth, whether it can send, and whether a key has its own budget.
A few email APIs publish an MCP server. AgentiSend's is hosted at https://api.agentisend.com/mcp, with 84 tools (44 listed by default). A bearer key or OAuth both reach those tools, a tool can send, and each key has its own budget. The other rows are what each vendor's page said on the capturedOn date. A cell that page does not state says "not documented". A row older than 90 days is stale.
The table
| Provider | Hosted URL | Official | Tools | Auth | Can it send | Per-key budget | Source | capturedOn |
|---|---|---|---|---|---|---|---|---|
| AgentiSend | https://api.agentisend.com/mcp | yes | 84 (44 listed by default) | Bearer API key or OAuth | yes | yes, on the key | MCP guide | 2026-09-29 |
| Resend | https://mcp.resend.com/mcp | yes | not documented | OAuth, or a bearer API key when a browser login is not possible | yes: the page lists send, list, get, cancel, update, and batch send | not documented | https://resend.com/docs/mcp-server | 2026-09-29 |
| AgentMail | https://mcp.agentmail.to/mcp | yes | 36, plus 2 organization tools on an OAuth session | OAuth, or an x-api-key header | yes: send_message sends from an inbox | not documented | https://docs.agentmail.to/integrations/mcp | 2026-09-29 |
| Loops | https://mcp.loops.so | yes | 4: search, describe, execute, teams | OAuth | yes: execute can send a published transactional template | not documented | https://loops.so/agents/mcp | 2026-09-29 |
| Plunk | no hosted URL; the package runs locally | yes | 23: 10 read-only and 13 writing | a secret key on the local process | yes, and a send to more than one recipient asks a person to confirm | not documented; caps on that page are per project | https://docs.useplunk.com/guides/mcp-server | 2026-09-28 |
| Postmark | no hosted URL; npx @activecampaign/postmark-mcp | yes | 24 | a server token in the local process environment | yes | not documented | https://postmarkapp.com/lp/mcp | 2026-09-29 |
| Mailgun | no hosted URL; the server runs locally | yes | not documented | an API key in the local process environment | the page describes the server as a way to send email | not documented | https://documentation.mailgun.com/docs/mailgun/mcp | 2026-09-29 |
| Twilio (SendGrid docs) | https://mcp.twilio.com/docs | yes | 2: twilio__search and twilio__retrieve | the page says it does not authenticate | no: it searches public API documentation and does not send mail | not documented | https://www.twilio.com/docs/ai/mcp | 2026-09-28 |
AgentiSend's tool count is the catalogue the MCP server serves. A competitor number is the number that vendor's page printed. "Not documented" means that page did not say.
POST /api-keys, PATCH /limits/keys/{id}, and POST /emails are the three requests behind the AgentiSend row. GET /limits/keys/{id} reads the budget back.
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Written by the AgentiSend team.