MCP server

Mail Blaze MCP by usefulapi

io.usefulapi/mailblaze

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

Manage Mail Blaze lists, subscribers, templates, campaigns and reports; send transactional email.

Website Source

At a glance

Type

MCP server

Publisher

usefulapi.io (verified by the MCP Registry)

Status

Working at last check

Tools

26

Token cost

About 5,121 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

{"mcpServers":{"mailblaze":{"httpUrl":"https://mailblaze.usefulapi.io/mcp"}}}

Cursor

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

VS Code

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

Antigravity

agy mcp add mailblaze https://mailblaze.usefulapi.io/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"mailblaze","server_url":"https://mailblaze.usefulapi.io/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"mailblaze","server_url":"https://mailblaze.usefulapi.io/mcp"}

Tools

• mailblaze_add_subscriber ~318 tokens
  WRITE, MAY SEND A CONFIRMATION EMAIL: add one subscriber to a mailing list. Depending on the list's settings Mail Blaze may send the person a confirmation (double opt-in) email. Only add people who agreed to receive your email. An email that is already on the list answers with a conflict error.
• mailblaze_add_subscribers_bulk ~338 tokens
  WRITE, MAY SEND CONFIRMATION EMAILS: add up to 100 subscribers to a mailing list in one request; an email already on the list is updated instead. Depending on the list's settings Mail Blaze may send confirmation emails. Only add people who agreed to receive your email.
• mailblaze_create_campaign Sends messages · ~499 tokens
  WRITE, SENDS EMAIL TO PEOPLE: create a campaign for a mailing list (or one of its segments) from an existing template and schedule it for send_at. Once it goes out it reaches every subscriber of the list or segment, may use sending credit and cannot be recalled. Confirm the list, segment, subject, t
• mailblaze_create_template ~149 tokens
  WRITE: create an email template from HTML (the tool base64-encodes it). Mail Blaze requires the HTML to contain an unsubscribe link. Sends nothing.
• mailblaze_find_subscriber_by_email ~147 tokens
  Look up a subscriber in one list by email address. Returns the subscriber (with its uid) or a not-found error.
• mailblaze_get_campaign ~101 tokens
  Get one campaign by uid: sender, subject, list, template, status and schedule.
• mailblaze_get_campaign_inbox_breakdown ~106 tokens
  Inbox-provider breakdown (e.g. Gmail, Outlook, Yahoo) of a campaign's delivery.
• mailblaze_get_campaign_summaries ~155 tokens
  Bulk report summary (sent, opens, clicks, bounces, unsubscribes) for up to 50 campaigns in one call. Read-only (it is a POST in the API only because of the id list).
• mailblaze_get_list ~117 tokens
  Get one mailing list by its uid: general settings, default sender, company details and counts.
• mailblaze_get_report_job ~106 tokens
  Status (and result when finished) of an asynchronous report job, as returned in a 202 reply with a job_id.
• mailblaze_get_subscriber ~158 tokens
  Get one subscriber of a list by subscriber uid (status, fields, dates).
• mailblaze_get_subscriber_activity ~230 tokens
  Email activity (sends, opens, clicks, bounces) of one subscriber by email address, optionally limited to one list. Cursor-paged.
• mailblaze_get_template ~93 tokens
  Get one email template by uid (name and content).
• mailblaze_get_transactional_email ~102 tokens
  Get one transactional email by uid: recipient, subject, status and timestamps.
• mailblaze_list_campaign_events ~260 tokens
  List the individual events of a campaign by kind: opens, clicks, bounces or unsubscribes. Cursor-paged: pass the reply's next_cursor back until it is null. For very large campaigns Mail Blaze answers 202 with a job_id; check it with mailblaze_get_report_job.
• mailblaze_list_campaigns ~125 tokens
  List the account's email campaigns (uid, name, status, dates). Use the campaign uid for details and reports.
• mailblaze_list_list_fields ~172 tokens
  List the fields of a mailing list (label, tag, type, required). The tags (EMAIL, FNAME, LNAME, custom ones) are the keys used when adding or updating subscribers.
• mailblaze_list_lists ~164 tokens
  List the account's mailing lists (name, uid, subscriber counts, defaults). Use the list uid in the other tools. Paged: page + per_page.
• mailblaze_list_segments ~156 tokens
  List the segments defined on a mailing list (uid, name). A segment uid can be used when creating a campaign.
• mailblaze_list_subscribers ~160 tokens
  List the subscribers of a mailing list (sets of 10 per page; use page to go on). Contains personal data (emails, names).
• mailblaze_list_templates ~121 tokens
  List the account's email templates (uid, name). A template uid is needed to create a campaign.
• mailblaze_list_transactional_emails ~124 tokens
  List the transactional emails sent through the account (uid, recipient, subject, status). Paged.
• mailblaze_resubscribe_subscriber ~156 tokens
  WRITE: set a previously unsubscribed subscriber back to subscribed so campaigns reach them again. Only do this when the person asked to be re-added (consent).
• mailblaze_send_transactional_email Sends messages · ~551 tokens
  WRITE, SENDS ONE EMAIL NOW: send a single one-to-one email to one recipient through Mail Blaze. It leaves immediately, uses sending credit and cannot be recalled. Give either html (the body) or template_id (a transactional template, with merge_tags covering every tag in it), not both. Confirm the re
• mailblaze_unsubscribe_subscriber ~195 tokens
  WRITE: set a subscriber's status to unsubscribed so they receive no more campaigns from this list. By default Mail Blaze also adds the address to the account's local blacklist. Do this only when the person asked to stop (or a data-protection request requires it). The subscriber record is kept.
• mailblaze_update_subscriber ~318 tokens
  WRITE: update a subscriber's name or custom fields. Pass the subscriber's current email (Mail Blaze requires it) plus only the values to change. Does not change subscription status.

Browse

• Email
• Email marketing

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