Mail Blaze MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.15.4Updated Nov 7, 2026

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

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableCommunication & CollaborationData & AnalyticsBusiness & Commerce

Overview

AI-generated overview

Remote MCP server for Mail Blaze: manage mailing lists, subscribers, templates and campaigns, read reports, and send email.

What you can do
  • List and inspect mailing lists, their fields, segments and subscribers, and look up a subscriber by email
  • Add, bulk-add, update, unsubscribe and resubscribe subscribers
  • List, read and create HTML email templates
  • List and inspect campaigns, create and schedule a campaign from a template
  • Read campaign reports: summaries, inbox-provider breakdown, opens, clicks, bounces and unsubscribes, plus per-subscriber activity and async report jobs
  • List and send transactional emails, and check usage or manage the subscription plan
When to use it
Useful when you want an assistant to work with an existing Mail Blaze account: answering questions about lists and campaign performance, maintaining subscriber records, or preparing and scheduling campaigns and one-off emails.
Requirements
Remote endpoint at added by URL only; sign-in is via OAuth and the login page asks for a Mail Blaze API public key, which is stored per user. No API key or Authorization header goes in the client config. A Mail Blaze account is required.
Before you install
The Mail Blaze API public key has full access to the account. Write tools change data: adding subscribers may trigger confirmation emails, unsubscribing also blacklists the address by default, and creating a campaign or sending a transactional email sends real email, uses sending credit and cannot be recalled. Subscriber data includes personal emails and names. Free plan is limited to 50 tool calls a month; paid plans are billed through a payment link.

Installation

In SourceWeft

  1. Open Mail Blaze MCP by usefulapi in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.usefulapi%2Fmailblaze/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "mail-blaze-by-usefulapi": {
      "type": "http",
      "url": "https://mailblaze.usefulapi.io/mcp"
    }
  }
}

README

Mail Blaze MCP by usefulapi

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

Live endpoint: https://mailblaze.usefulapi.io/mcp · Homepage: https://usefulapi.io/mailblaze

Connect

  • Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://mailblaze.usefulapi.io/mcp.
  • Claude Code: claude mcp add --transport http mailblaze https://mailblaze.usefulapi.io/mcp, then run /mcp to log in.
  • VS Code: Add to VS Code.
  • Cursor and other clients: add the URL as a remote MCP server:
json
{  "mcpServers": {    "mailblaze": {      "url": "https://mailblaze.usefulapi.io/mcp"    }  }}

Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your Mail Blaze credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/mailblaze/

On first connect you'll paste a Mail Blaze API public key (Mail Blaze → Profile menu → API Keys: create a key and copy the Public key). The key has full access to your account; you can revoke it there at any time. Your credentials are validated, stored per-user, and scoped to you — no keys in config files.

Tools

ToolTypeWhat it does
mailblaze_list_listsreadList mailing lists
mailblaze_get_listreadGet a mailing list
mailblaze_list_list_fieldsreadList a list's custom fields
mailblaze_list_segmentsreadList a list's segments
mailblaze_list_subscribersreadList subscribers
mailblaze_get_subscriberreadGet a subscriber
mailblaze_find_subscriber_by_emailreadFind a subscriber by email
mailblaze_add_subscriberwriteAdd a subscriber
mailblaze_add_subscribers_bulkwriteAdd or update subscribers in bulk
mailblaze_update_subscriberwriteUpdate a subscriber
mailblaze_unsubscribe_subscriberwriteUnsubscribe a subscriber
mailblaze_resubscribe_subscriberwriteResubscribe a subscriber
mailblaze_list_templatesreadList email templates
mailblaze_get_templatereadGet an email template
mailblaze_create_templatewriteCreate an email template
mailblaze_list_campaignsreadList campaigns
mailblaze_get_campaignreadGet a campaign
mailblaze_create_campaignwriteCreate and schedule a campaign
mailblaze_get_campaign_summariesreadGet campaign report summaries
mailblaze_get_campaign_inbox_breakdownreadGet a campaign's inbox breakdown
mailblaze_list_campaign_eventsreadList a campaign's opens, clicks, bounces or unsubscribes
mailblaze_get_subscriber_activityreadGet a subscriber's activity
mailblaze_get_report_jobreadGet a report job's status
mailblaze_list_transactional_emailsreadList transactional emails
mailblaze_get_transactional_emailreadGet a transactional email
mailblaze_send_transactional_emailwriteSend a transactional email
mailblaze_usage_statusmetaUsage status (free-tier meter)
mailblaze_request_featuremetaRequest a missing feature
mailblaze_upgrademetaUpgrade to Pro or Pro+
mailblaze_cancel_subscriptionmetaCancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Pro (per API key)$9/mo or $90/yr (2 months free)Unlimited*

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with mailblaze_upgrade (it returns a Stripe Checkout link). Cancel any time with mailblaze_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running mailblaze_upgrade before then undoes the cancel. Or write to [email protected].

License

Source: servers/mailblaze/README.md at commit 4046075

Tools

26

mailblaze_list_lists

List mailing lists

List the account's mailing lists (name, uid, subscriber counts, defaults). Use the list uid in the other tools. Paged: page + per_page.

Parameterspageper_page

mailblaze_get_list

Get a mailing list

Get one mailing list by its uid: general settings, default sender, company details and counts.

Parameterslist_uidrequired

mailblaze_list_list_fields

List a list's custom fields

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.

Parameterspagelist_uidrequired

mailblaze_list_segments

List a list's segments

List the segments defined on a mailing list (uid, name). A segment uid can be used when creating a campaign.

Parameterspagelist_uidrequired

mailblaze_list_subscribers

List subscribers

List the subscribers of a mailing list (sets of 10 per page; use page to go on). Contains personal data (emails, names).

Parameterspagelist_uidrequired

mailblaze_get_subscriber

Get a subscriber

Get one subscriber of a list by subscriber uid (status, fields, dates).

Parameterslist_uidrequiredsubscriber_uidrequired

mailblaze_find_subscriber_by_email

Find a subscriber by email

Look up a subscriber in one list by email address. Returns the subscriber (with its uid) or a not-found error.

Parametersemailrequiredlist_uidrequired

mailblaze_add_subscriber

Add a subscriber

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.

Parametersemailrequiredlist_uidrequiredlast_namefirst_namecustom_fields

mailblaze_add_subscribers_bulk

Add or update subscribers in bulk

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.

Parameterslist_uidrequiredsubscribersrequired

mailblaze_update_subscriber

Update a subscriber

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.

Parametersemailrequiredlist_uidrequiredlast_namefirst_namecustom_fieldssubscriber_uidrequired

mailblaze_unsubscribe_subscriber

Unsubscribe a subscriber

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.

Parameterslist_uidrequiredsubscriber_uidrequired

mailblaze_resubscribe_subscriber

Resubscribe a subscriber

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).

Parameterslist_uidrequiredsubscriber_uidrequired

mailblaze_list_templates

List email templates

List the account's email templates (uid, name). A template uid is needed to create a campaign.

Parameterspage

mailblaze_get_template

Get an email template

Get one email template by uid (name and content).

Parameterstemplate_uidrequired

mailblaze_create_template

Create an email template

WRITE: create an email template from HTML (the tool base64-encodes it). Mail Blaze requires the HTML to contain an unsubscribe link. Sends nothing.

Parametershtmlrequirednamerequired

mailblaze_list_campaigns

List campaigns

List the account's email campaigns (uid, name, status, dates). Use the campaign uid for details and reports.

Parameterspage

mailblaze_get_campaign

Get a campaign

Get one campaign by uid: sender, subject, list, template, status and schedule.

Parameterscampaign_uidrequired

mailblaze_create_campaign

Create and schedule a campaign

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, template and send time with the user before calling. Needs a template uid (mailblaze_list_templates) and a list uid (mailblaze_list_lists).

Parametersnamerequiredsend_atrequiredsubjectrequiredlist_uidrequiredreply_torequiredfrom_namerequiredfrom_emailrequiredsegment_uidtemplate_uidrequired

mailblaze_get_campaign_summaries

Get campaign report summaries

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).

Parameterscampaign_uidsrequired

mailblaze_get_campaign_inbox_breakdown

Get a campaign's inbox breakdown

Inbox-provider breakdown (e.g. Gmail, Outlook, Yahoo) of a campaign's delivery.

Parameterscampaign_uidrequired

mailblaze_list_campaign_events

List a campaign's opens, clicks, bounces or unsubscribes

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.

Parameterskindrequiredlimitcursorcampaign_uidrequired

mailblaze_get_subscriber_activity

Get a subscriber's activity

Email activity (sends, opens, clicks, bounces) of one subscriber by email address, optionally limited to one list. Cursor-paged.

Parametersemailrequiredlimitcursorlist_uid

mailblaze_get_report_job

Get a report job's status

Status (and result when finished) of an asynchronous report job, as returned in a 202 reply with a job_id.

Parametersjob_idrequired

mailblaze_list_transactional_emails

List transactional emails

List the transactional emails sent through the account (uid, recipient, subject, status). Paged.

Parameterspage

mailblaze_get_transactional_email

Get a transactional email

Get one transactional email by uid: recipient, subject, status and timestamps.

Parametersemail_uidrequired

mailblaze_send_transactional_email

Send a transactional email

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 recipient and content with the user before calling. Not for bulk or marketing mail; use a campaign for that.

Parametershtmlsubjectrequiredto_namerequiredto_emailrequiredfrom_namerequiredfrom_emailrequiredmerge_tagstemplate_idreply_to_namereply_to_email

Version history

13
  1. v1.15.4LatestNov 7, 2026
  2. v1.14.3Nov 5, 2026
  3. v1.14.2Nov 5, 2026
  4. v1.14.1Nov 4, 2026
  5. v1.14.0Nov 3, 2026
  6. v1.13.1Nov 3, 2026
  7. v1.12.0Nov 1, 2026
  8. v1.10.0Oct 31, 2026
  9. v1.9.0Oct 31, 2026
  10. v1.8.2Oct 30, 2026
  11. v1.8.0Oct 30, 2026
  12. v1.3.0Oct 26, 2026
  13. v1.0.3Oct 25, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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