Mailcheer MCP server

• Registry namecom.mailcheer/mailcheerverified in the MCP registry

The registry name sits under mailcheer.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-09
• Tools18
• Server calls itselfmailcheer
• Server version1.0.0
• Protocol version2025-06-18

On 2026-10-09 the server answered initialize and tools/list without a sign-in. First answer in 205 ms.

• send_email

  Sends a single (transactional) email to one or more addresses. The sender must belong to a verified domain of the workspace — call get_account to see which ones. An address suppressed for a bounce, a complaint or by hand fails the entire…

• get_account

  Returns the workspace this key grants access to, its scopes, plan, remaining emails this month (queued sends included), when the counter resets, billing status, member and domain limits, sending domains (verified or not) and registered…

• list_subscribers

  Lists the workspace's subscribers, page by page. Use `cursor` with the `next_cursor` value from the response to get the next page. `status` filters on subscribed, pending, unsubscribed, bounced, or complained.

• add_subscriber

  Adds or updates a subscriber. By default the person enters as PENDING and receives a confirmation email: that is double opt-in, and it protects the workspace's sending reputation. `double_opt_in: false` subscribes directly and must only…

• remove_subscriber

  Unsubscribes an address and adds it to the workspace's suppression list: no more campaigns, automations, or sends carrying `unsubscribe_url`. The record is not deleted — that is what prevents the address from coming back on the next file…

• update_subscriber

  Updates the first name (`first_name`), last name (`last_name`) and custom fields (`fields`, by technical key) of an existing subscriber. The email address cannot be changed: it is the identifier. Tags are managed with `tag_subscriber`…

• list_tags

  The workspace's tags, with how many subscribers carry each one (`subscribers`) and, among them, the active ones (`subscribed`). Read this before tagging: reuse an existing name rather than creating a near-duplicate.

• tag_subscriber

  Adds (`add`) and removes (`remove`) tags on ONE existing subscriber, and nothing else: no subscription, no confirmation email, no status touched. Prefer it to add_subscriber for changing tags: add_subscriber is a subscription and sends…

• erase_subscriber

  Erases a person from the workspace at THEIR request (right to erasure): record, name, fields, proof of consent, tags. Statistics of campaigns already sent do not move; the suppression list is not touched. To stop someone receiving…

• list_suppression

  Suppressed addresses, with their reason: bounced, complained or manually suppressed (nothing goes to them), or unsubscribed (no more campaigns, automations, or sends carrying `unsubscribe_url`, but an individual email still reaches them)…

• add_suppression

  Adds an address to the workspace's suppression list. By default (`manual`), it will receive nothing further, neither campaigns nor individual emails; with `unsubscribe`, only campaigns, automations, and sends carrying `unsubscribe_url`…

• list_campaigns

  The workspace's campaigns, from newest to oldest, with their status: draft, scheduled, sending, or sent.

• create_campaign

  Creates a DRAFT. Nothing is sent: you then need to call send_campaign, or send it from the Mailcheer workspace. Content is written in plain text in `text` — a blank line separates paragraphs, "#" at the start of a line makes a heading…

• update_campaign

  Edits a DRAFT: name, subject, preheader, kind, sender, content (`text`). Nothing is sent. Prefer it to create_campaign to rework a text: otherwise the old draft stays in the list. A scheduled, sending or sent campaign cannot be edited…

• preview_campaign_send

  Read-only: nothing is sent. Returns exactly what send_campaign would do right now — would it go out (and if not, why), and how many people would receive it. With `to`, reports address by address who is kept and who is excluded, with the…

• send_campaign

  ⚠️ IRREVERSIBLE. Locks the recipient list and triggers sending to ALL active subscribers in the workspace — or, with `to`, only to the requested addresses that are active subscribers (never an unsubscribed or suppressed address). A sent…

• get_campaign_stats

  Status and figures for a campaign: recipients, sent, delivered, opened, clicked, bounced, complained. Rates are calculated on delivered messages, not on recipients. Every rate comes twice: open_rate and click_rate include bots (security…

• get_email

  Status of an email sent via send_email: sent, delivered, bounced, or complained. Amazon's delivery callback arrives a few seconds to a few minutes after sending — a "sent" status right after the call is normal.