Find B2B leads with verified work emails, find and verify emails, and run cold email outreach.
Marketing & SalesCommunication & messaging
- Passed: Handshake
- Passed: Tools listed
- Passed: Updated recently
Median latency 173 ms · Last checked
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Evidence for your next connection.
Independent measurements of remote MCP servers. Every observation has a timestamp.
Read-only probesMCP server · Communication & messaging
Manage Mail Blaze lists, subscribers, templates, campaigns and reports; send transactional email.
1 failed · 8 not measured
Median of successful probes over 7 days
Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.
Tool definitions returned by this server
Independent monitoring
Outdated check
Last connection measurement is over 24 hours old. Current availability is unknown.
Last checked| Test area | Passed | Failed | Unmeasured |
|---|---|---|---|
ConnectionCan a client connect and discover tools? | 5 | 0 | 0 |
Reliability & speedDoes it respond consistently and quickly? | 0 | 0 | 4 |
Access & authenticationWhat is required to use this server? | 1 | 0 | 2 |
Tool qualityAre the tool definitions usable by an agent? | 3 | 1 | 0 |
Publisher identityCan the publisher be traced to its source? | 4 | 0 | 2 |
Unmeasured means there is not enough evidence to decide. How these checks work
Start using Mail Blaze MCP by usefulapi
Choose your client, copy the configuration, then enable the server in your client’s MCP settings.
Run this command in your terminal, then restart Claude Code.
Claude Code
claude mcp add --transport http mail-blaze-mcp-by-usefulapi https://mailblaze.usefulapi.io/mcpCapabilities
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.
DiscoveredWRITE, 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.
DiscoveredWRITE, 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).
DiscoveredWRITE: create an email template from HTML (the tool base64-encodes it). Mail Blaze requires the HTML to contain an unsubscribe link. Sends nothing.
DiscoveredLook up a subscriber in one list by email address. Returns the subscriber (with its uid) or a not-found error.
DiscoveredGet one campaign by uid: sender, subject, list, template, status and schedule.
DiscoveredInbox-provider breakdown (e.g. Gmail, Outlook, Yahoo) of a campaign's delivery.
DiscoveredBulk 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).
DiscoveredGet one mailing list by its uid: general settings, default sender, company details and counts.
DiscoveredStatus (and result when finished) of an asynchronous report job, as returned in a 202 reply with a job_id.
DiscoveredGet one subscriber of a list by subscriber uid (status, fields, dates).
DiscoveredEmail activity (sends, opens, clicks, bounces) of one subscriber by email address, optionally limited to one list. Cursor-paged.
DiscoveredGet one email template by uid (name and content).
DiscoveredGet one transactional email by uid: recipient, subject, status and timestamps.
DiscoveredList 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.
DiscoveredList the account's email campaigns (uid, name, status, dates). Use the campaign uid for details and reports.
DiscoveredList 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.
DiscoveredList the account's mailing lists (name, uid, subscriber counts, defaults). Use the list uid in the other tools. Paged: page + per_page.
DiscoveredList the segments defined on a mailing list (uid, name). A segment uid can be used when creating a campaign.
DiscoveredList the subscribers of a mailing list (sets of 10 per page; use page to go on). Contains personal data (emails, names).
DiscoveredList the account's email templates (uid, name). A template uid is needed to create a campaign.
DiscoveredList the transactional emails sent through the account (uid, recipient, subject, status). Paged.
DiscoveredWRITE: 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).
DiscoveredWRITE, 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.
DiscoveredWRITE: 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.
DiscoveredWRITE: 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.
DiscoveredRecent measurements
| Checked | Result | Response | Tools |
|---|---|---|---|
| Connected | 59 ms | 26 |