# Enginemailer Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## Enginemailer

Manage email marketing campaigns, subscriber lists and transactional emails through Enginemailer.

- Record: https://musedirectory.ai/connector/enginemailer
- Category: Marketing & Ads
- Developer: usefulapi (https://usefulapi.io/enginemailer/)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, 260ms, checked 2026-10-29T22:56:12Z
- Endpoint: https://enginemailer.usefulapi.io/mcp
- Auth: No account needed; Pricing: unknown
- Screening: Screened, no issues found (2026-10-29T22:56:12Z)
- Source: Found in the official MCP Registry (io.usefulapi/enginemailer) https://registry.modelcontextprotocol.io/v0/servers?search=io.usefulapi%2Fenginemailer

Connect to Enginemailer to read and manage subscribers, lists and campaigns. Create and send marketing campaigns to segmented audiences, add or update subscribers, and send transactional emails. Requires a verified sender domain and paid Enginemailer account.

Example request: "Create and send a marketing campaign to customers in a specific segment who have opted in to emails."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Enginemailer to help me. It is a free service with an MCP server at https://enginemailer.usefulapi.io/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Tools:
- enginemailer_get_subscriber: One subscriber by email: id, status and all custom field values. GET /restapi/subscriber/emsubscriber/getSubscriber.
- 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_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_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_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
- 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_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_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/ListCamp
- 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_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_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/Campa
- 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_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 fir
- 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 an
- 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_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).

Screening checks:
- MCP handshake: pass (Answered in 260ms)
- Domain against threat feeds (Cloudflare security DNS): pass (enginemailer.usefulapi.io, usefulapi.io not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: pass (17 tools read, nothing found)
- Inputs asking for passwords, card numbers or seed phrases: pass (None found)
- Domain and redirects: pass (No redirects off the domain)
- AI review of purpose and tool behavior: pass (No concerns)