Enginemailer MCP by usefulapi MCP Server

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answering

Enginemailer MCP by usefulapi is answering right now. Last checked 10 min ago. It exposes 17 tools. Last commit 25 Oct 2026.

Read Enginemailer subscribers, lists and campaigns; add subscribers, create and send campaigns.

Uptime history 26 hours of history

26 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

395 ms

Response time

average over 24h

Stars

last commit 25 Oct 2026

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 25 October 2026. No other catalogue keeps this.

25 Oct a tool changed version4 times that day

and 3 more, back to 25 October 2026

Nothing serious here today

Today is the operative word: we check Enginemailer MCP by usefulapi every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add enginemailer --transport http https://enginemailer.usefulapi.io/mcp

Settings → Connectors → Add custom connector, then paste this address

https://enginemailer.usefulapi.io/mcp

~/.codex/config.toml

[mcp_servers.enginemailer]
url = "https://enginemailer.usefulapi.io/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "enginemailer": {
      "url": "https://enginemailer.usefulapi.io/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "enginemailer": {
      "type": "http",
      "url": "https://enginemailer.usefulapi.io/mcp"
    }
  }
}

Available tools 17

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

enginemailer

enginemailer_add_subscriber

WRITE: add a subscriber to the account (optionally into subcategories, with custom field values). Only add people who consented to marketing email. Free accounts may insert 50 subscribers a day, paid accounts 10,000. POST /restapi/subscriber/emsubscriber/insertSubscriber.

enginemailer_assign_campaign_recipients

WRITE: set who a campaign will go to: all subscribers, or the subscribers in the given subcategory ids (match_type any = OR, all = AND). Does not send anything. Needs a paid account. POST /restapi/campaign/emcampaign/AssignRecipientList.

enginemailer_check_transactional_report_export

Status of a report export (Processing or Complete); when complete it includes the CSV download URL. POST /RESTAPI/V2/Submission/Report/CheckExport (read-only).

enginemailer_create_campaign

WRITE: create a campaign DRAFT. Nothing is sent: assign recipients with enginemailer_assign_campaign_recipients, then send with enginemailer_send_campaign. The sender domain must be verified in Enginemailer; max 200 campaigns per account. Needs a paid account. POST /restapi/Campaign/EMCampaign/CreateCampaign.

enginemailer_get_campaign_stats

Delivery results of a DELIVERED campaign: emails sent, delivered, bounces, opens, unique opens, clicks, unique clicks, unsubscribes, spam complaints. Needs a paid account. GET /restapi/campaign/emcampaign/getcampaigndeliverystatus.

enginemailer_get_subscriber

One subscriber by email: id, status and all custom field values. GET /restapi/subscriber/emsubscriber/getSubscriber.

enginemailer_list_campaign_categories

The categories that campaign recipients can be filtered by (id, name, description). Needs a paid account. GET /restapi/campaign/emcampaign/GetCategoryList.

enginemailer_list_campaign_subcategories

The subcategories of one campaign category (id, name, description); use these ids in enginemailer_assign_campaign_recipients. Needs a paid account. GET /restapi/campaign/emcampaign/GetSubCategoryList.

enginemailer_list_campaigns

List campaigns that have NOT been delivered yet (drafts and scheduled ones): id, name, subject, sender and schedule. Delivered campaigns are not listed by the API; use enginemailer_get_campaign_stats with a known id. Needs a paid account. GET /restapi/campaign/emcampaign/ListCampaign.

enginemailer_list_custom_fields

The subscriber custom field definitions (key, name, type). Use the keys when adding or updating subscribers. GET /restapi/subscriber/emsubscriber/getCustomField.

enginemailer_list_subscriber_categories

The subscriber category tree: each category with its subcategories (ids, names). Use the subcategory ids when adding or updating subscribers and when assigning campaign recipients. GET /restapi/subscriber/emsubscriber/getSubCategory.

enginemailer_save_subscriber_category

WRITE: create a subscriber category (category_id 0) or update one (its id), with subcategories (subcategory_id 0 creates one). Names and descriptions max 128 characters. POST /restapi/subscriber/emsubscriber/updateCategory.

enginemailer_send_campaign

WRITE, SENDS EMAIL TO CUSTOMERS NOW and cannot be undone: delivers the campaign to its assigned recipients immediately. The campaign needs at least one recipient and must not be scheduled or already delivered. Show the user the campaign and its audience and get their go-ahead first; set confirm to true only then. Needs a paid account. GET /restapi/campaign/emcampaign/SendCampaign.

enginemailer_send_transactional_email

WRITE, SENDS ONE EMAIL NOW and cannot be undone: submits a transactional email to one recipient (plus optional CC/BCC). Needs a sender address on a verified domain; give either subject + content_html, or a template_id from the Enginemailer portal (the template supplies subject and sender name). Total message incl. attachments max 5 MB. Confirm the recipient and text with the user first; set confirm to true only then. POST /RESTAPI/V2/Submission/SendEmail.

enginemailer_start_transactional_report_export

Start a CSV export of the transactional email delivery report for a period (start date at most 60 days back). Returns an export id; poll it with enginemailer_check_transactional_report_export. Creates a report file only; nothing is sent. POST /RESTAPI/V2/Submission/Report/Export.

enginemailer_unsubscribe_subscriber

WRITE: unsubscribe a subscriber so they no longer receive campaigns. Reversing it needs the subscriber to opt in again in Enginemailer. GET /restapi/subscriber/emsubscriber/unSubSubscriber.

enginemailer_update_subscriber

WRITE: change an existing subscriber's subcategories and/or custom fields. subcategories_mode: append (default), remove (drop the given subcategories) or replace (the given list becomes the full list). custom_fields_mode: update_given (change only the given fields) or replace_all (default; fields not given are cleared). POST /restapi/subscriber/emsubscriber/updateSubscriber.

Endpoints

URL	Transport	State	Latency	Checked
https://enginemailer.usefulapi.io/mcp	streamable-http	answering	137 ms	10 min ago

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Enginemailer MCP by usefulapi — questions

Answers built from our own checks of this server.

What can Enginemailer MCP by usefulapi do?

It exposes 17 tools, read directly from the server on our last check. Among them: enginemailer_add_subscriber, enginemailer_assign_campaign_recipients, enginemailer_check_transactional_report_export, enginemailer_create_campaign, enginemailer_get_campaign_stats, enginemailer_get_subscriber and 11 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Enginemailer MCP by usefulapi working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 395 ms. The bar chart above shows every period we have measured.

How do I connect Enginemailer MCP by usefulapi?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Enginemailer MCP by usefulapi need an API key?

No. Enginemailer MCP by usefulapi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 17 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Enginemailer MCP by usefulapi?

It answers our handshake in 395 ms on average, which is faster than 36% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Enginemailer MCP by usefulapi open source?

The code is open source: it is published under the MIT licence, written in JavaScript, 0 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at enginemailer.usefulapi.io, which runs on its operator's own terms.