---
title: "Postmark MCP server for AI agents - actionlake"
description: "Give Claude 87 Postmark actions through one MCP server: stats, domains, sender signatures. Your agent never holds the credential. 100,000 calls a month free."
canonical: https://actionlake.com/connectors/postmark
updated: 2026-10-22
---

Connectors · Email & messaging

# Postmark MCP server for AI agents.

actionlake is an MCP gateway: one remote MCP server that connects Claude and other MCP clients to Postmark and the rest of your systems. It gives your agent 87 Postmark actions (45 reads, 33 writes and 9 that wait for a confirmation) and holds the Postmark credential itself, so the agent never does. It paces Postmark's limits and records every call.

[Connect Postmark free](https://actionlake.com/console?start=sandbox) [See pricing](https://actionlake.com/pricing)

100,000 free calls a month. No card, no email, no password: press Start a free sandbox on the next screen and keep the key it shows you.

`claude mcp add --transport http actionlake https://connect.actionlake.com/mcp`

the first call

```
do {
  action: "postmark.domains.list",
  intent: "check which Postmark account is connected"
}
# List domains · read · 1 upstream call
```

- 87 actions in one signed file
- 45 read look, never change
- 33 write create and update
- 9 wait for a yes destructive, confirmed first

Set up

## Connect Postmark in three steps.

1. 01
   ### Add actionlake to Claude.
   Run the command once in Claude Code; its consent page can create a free sandbox: 100,000 calls a month, no card. In the Claude app, add a custom connector with the URL below and paste your key on the consent page. Creating a new sandbox from the Claude app is not yet tested by us.
   `https://connect.actionlake.com/mcp`
2. 02
   ### Connect Postmark.
   Header credentials. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead. actionlake stores what you paste write-only, sealed under your tenant's key.
   - `server_token` Postmark server API token
   - `account_token` Postmark account API token (optional)
   ```
   account { op: "connections.requirements", service: "postmark" }
   # free: exactly what to paste, and what is found for you
   ```
3. 03
   ### Make the first call. Check before a write.
   Ask in plain words; Claude picks the action. Before anything changes, `check` validates the call and prices it, for free.
   ```
   do    { action: "postmark.domains.list" }
   # list domains · read · 1 upstream call
   check { action: "postmark.domains.create", input: { … } }
   # free: inputs, permissions, cost and confirmations, nothing sent
   ```

Postmark at a glance

**Sign-in**

Header credentials. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead.

**You provide**

`server_token` `account_token`

**Limits we pace to**

300 calls a minute, per connection

**API covered**

Postmark REST API (api.postmarkapp.com), reference as of 2026-10`api.postmarkapp.com`

**Built from**

Postmark's documentation, read 22 October 2026[postmarkapp.com](https://postmarkapp.com/developer/api/overview) [postmarkapp.com](https://postmarkapp.com/swagger/server.yml) [postmarkapp.com](https://postmarkapp.com/swagger/account.yml)

**Service file**

Version 1.0.0, signed (Ed25519)

**Cached reads**

44 of 45 reads, for up to 5 minutes; a write clears what it affects

**Shared entities**

2, so ask can line Postmark up with your other systems

**Data**

Processed and stored in Sydney, Australia. No US region yet

Capabilities

## What an AI agent can do in Postmark.

87 actions in 19 areas. Every one carries its effect, so a key can allow the reads and hold the rest.

- **45** read look, never change
- **33** write create and update
- **9** destructive wait for a confirmation

1. ### Stats
   12
   12 read · 0 write · 0 destructive
   Get bounce counts · Get browser usage · Get click counts · Get click location
2. ### Domains
   9
   2 read · 5 write · 2 destructive
   List domains · Create a domain · Get a domain · Edit a domain
3. ### Sender signatures
   8
   2 read · 5 write · 1 destructive
   Create a sender signature · List sender signatures · Resend a sender signature confirmation · Get a sender signature
4. ### Templates
   7
   3 read · 3 write · 1 destructive
   List templates · Create a template · Get a template · Edit a template
5. ### Webhooks
   7
   3 read · 3 write · 1 destructive
   Create a webhook · List webhooks · Edit a webhook · Get a webhook
6. ### Message streams
   6
   2 read · 3 write · 1 destructive
   Create a message stream · List message streams · Get a message stream · Unarchive a message stream
7. ### Servers
   5
   2 read · 2 write · 1 destructive
   Create a server · List servers · Get a server · Edit a server
8. ### Bounces
   4
   3 read · 1 write · 0 destructive
   List bounces · Activate a bounce · Get a single bounce · Get bounce dump

**11 more areas · 29 actions**

- Email **4**
- Inbound messages **4**
- Bulk emails **3**
- Inbound rules **3**
- Outbound messages **3**
- Suppressions **3**
- Data removals **2**
- Message clicks **2**
- Message opens **2**
- Server **2**
- Delivery stats **1**

Top actions

## The Postmark API, shaped for agents.

The ids your agent types, what each does, and the one name it shares with other systems. 24 of Postmark's 24 action names are shared with at least one other connector, so an agent learns them once.

| Action | What it does | Effect | Same name in |
| --- | --- | --- | --- |
| `postmark.domains.list` List domains | List domains. | read | `comm.sending_domain.list` 18 connectors |
| `postmark.outbound_messages.search` Search outbound messages | Search outbound messages. | read | `comm.delivery_event.search` 4 connectors |
| `postmark.bounces.list` List bounces | List bounces. | read | `comm.delivery_event.list` 16 connectors |
| `postmark.domains.create` Create a domain | Create a domain. | write | `comm.sending_domain.create` 15 connectors |
| `postmark.templates.list` List templates | List templates. | read | `comm.email_template.list` 40 connectors |
| `postmark.domains.delete` Delete a domain | Delete a domain. | destructive | `comm.sending_domain.delete` 14 connectors |
| `postmark.templates.create` Create a template | Create a template. | write | `comm.email_template.create` 34 connectors |
| `postmark.email.send` Send a single email | Send a single email. | write | `comm.email.send` 32 connectors |
| `postmark.suppressions.list` Get suppressions (dump) | Get suppressions (dump). | read | `comm.suppression.list` 17 connectors |
| `postmark.suppressions.create` Create suppressions | Create suppressions. | write | `comm.suppression.create` 14 connectors |
| `postmark.webhooks.create` Create a webhook | Create a webhook. | write | `automation.webhook.create` 209 connectors |
| `postmark.webhooks.list` List webhooks | List webhooks. | read | `automation.webhook.list` 202 connectors |

Try it

## Prompts to paste into Claude.

Each one names the Postmark actions it will call, so you know what it reads and what it changes before you send it.

1. Read read
   List domains in Postmark and tell me what stands out.
   calls `postmark.domains.list`
2. Write write
   Create a domain in Postmark. Show me exactly what you will send before you save it.
   calls `postmark.domains.create`

Governance for Postmark

## Destructive actions wait for a yes.

9 Postmark actions are destructive. These are all of them:

- Delete a domain `postmark.domains.delete`
- Delete a template `postmark.templates.delete`
- Delete suppressions `postmark.suppressions.delete`
- Delete a webhook `postmark.webhooks.delete`
- Delete a server `postmark.servers.delete`
- Rotate a domain's DKIM key `postmark.domains.rotate_dkim`
- Delete an inbound rule trigger `postmark.inbound_rules.delete`
- Archive a message stream `postmark.message_streams.archive`
- Delete a sender signature `postmark.sender_signatures.delete`

A destructive action runs only with `confirm: true`. Under the `human` policy the agent cannot confirm for itself: the run stops until a named person approves, in the console or from a signed link in an email. The cap on a key is refused before the call is sent, never after.

do postmark.domains.delete confirm_policy: **human**

Delete a domain?

**intent:** the user asked me to delete a domain

run suspended · waiting for a named person · key _postmark-agent_ cannot confirm itself

In the console, or from an emailed signed link.

a key for this connector

```
account {
  op: "keys.create", name: "postmark-agent",
  allowed_actions: ["postmark.*"], cap_calls: 2000,
  confirm_policy: "human_for_writes",
  approval_rules: [
    { match: "postmark.domains.delete", approver: "lead@example.com" },
    { match: "postmark.templates.delete", approver: "lead@example.com" },
    { match: "postmark.suppressions.delete", approver: "lead@example.com" }
  ]
}
```

Illustrative. Scoped to Postmark only, capped at 2,000 upstream calls, every write confirmed, and the destructive ones approved by a named person.

Cost

## What Postmark costs on actionlake.

Every Postmark action is one upstream call, the only thing actionlake bills. Searching, `check`, `cost`, `account` and any call Postmark refused with 401, 403, 429 or a 5xx are free. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

- 1 upstream call per action all 87 Postmark actions
- 87 actions page each page of a long list is one call
- 44 reads can be cached a cache hit costs nothing
- 100,000 calls a month, free paid plans from US$49 a month for 250,000

[See pricing](https://actionlake.com/pricing)

Action index

## Every Postmark action.

87 actions by area: the id your agent calls, what it does, and its effect.

**Stats 12**

- `postmark.stats.bounce_counts` Get bounce counts read
- `postmark.stats.click_browser_families` Get browser usage read
- `postmark.stats.click_counts` Get click counts read
- `postmark.stats.click_locations` Get click location read
- `postmark.stats.click_platforms` Get browser platform usage read
- `postmark.stats.open_counts` Get email open counts read
- `postmark.stats.open_email_clients` Get email client usage read
- `postmark.stats.open_platforms` Get email platform usage read
- `postmark.stats.outbound_overview` Get outbound overview statistics read
- `postmark.stats.sent_counts` Get sent counts read
- `postmark.stats.spam_complaints` Get spam complaint counts read
- `postmark.stats.tracked_email_counts` Get tracked email counts read

**Domains 9**

- `postmark.domains.create` Create a domain write
- `postmark.domains.delete` Delete a domain destructive
- `postmark.domains.get` Get a domain read
- `postmark.domains.list` List domains read
- `postmark.domains.rotate_dkim` Rotate a domain's DKIM key destructive
- `postmark.domains.update` Edit a domain write
- `postmark.domains.verify_dkim` Verify a domain's DKIM write
- `postmark.domains.verify_return_path` Verify a domain's Return-Path write
- `postmark.domains.verify_spf` Verify a domain's SPF record (deprecated) write

**Sender signatures 8**

- `postmark.sender_signatures.create` Create a sender signature write
- `postmark.sender_signatures.delete` Delete a sender signature destructive
- `postmark.sender_signatures.get` Get a sender signature read
- `postmark.sender_signatures.list` List sender signatures read
- `postmark.sender_signatures.request_new_dkim` Request a new DKIM key for a sender signature (deprecated) write
- `postmark.sender_signatures.resend_confirmation` Resend a sender signature confirmation write
- `postmark.sender_signatures.update` Edit a sender signature write
- `postmark.sender_signatures.verify_spf` Verify a sender signature's SPF record (deprecated) write

**Templates 7**

- `postmark.templates.create` Create a template write
- `postmark.templates.delete` Delete a template destructive
- `postmark.templates.get` Get a template read
- `postmark.templates.list` List templates read
- `postmark.templates.push` Push templates to another server write
- `postmark.templates.update` Edit a template write
- `postmark.templates.validate` Validate a template read

**Webhooks 7**

- `postmark.webhooks.create` Create a webhook write
- `postmark.webhooks.delete` Delete a webhook destructive
- `postmark.webhooks.get` Get a webhook read
- `postmark.webhooks.get_statistics` Get webhook statistics read
- `postmark.webhooks.list` List webhooks read
- `postmark.webhooks.update` Edit a webhook write
- `postmark.webhooks.verify` Verify a webhook write

**Message streams 6**

- `postmark.message_streams.archive` Archive a message stream destructive
- `postmark.message_streams.create` Create a message stream write
- `postmark.message_streams.get` Get a message stream read
- `postmark.message_streams.list` List message streams read
- `postmark.message_streams.unarchive` Unarchive a message stream write
- `postmark.message_streams.update` Edit a message stream write

**Servers 5**

- `postmark.servers.create` Create a server write
- `postmark.servers.delete` Delete a server destructive
- `postmark.servers.get` Get a server read
- `postmark.servers.list` List servers read
- `postmark.servers.update` Edit a server write

**Bounces 4**

- `postmark.bounces.activate` Activate a bounce write
- `postmark.bounces.get` Get a single bounce read
- `postmark.bounces.get_dump` Get bounce dump read
- `postmark.bounces.list` List bounces read

**Email 4**

- `postmark.email.send` Send a single email write
- `postmark.email.send_batch` Send a batch of emails write
- `postmark.email.send_batch_with_templates` Send a batch of emails with templates write
- `postmark.email.send_with_template` Send an email with a template write

**Inbound messages 4**

- `postmark.inbound_messages.bypass` Bypass rules for a blocked inbound message write
- `postmark.inbound_messages.get` Get inbound message details read
- `postmark.inbound_messages.retry` Retry a failed inbound message write
- `postmark.inbound_messages.search` Search inbound messages read

**Bulk emails 3**

- `postmark.bulk_emails.get` Get bulk request status read
- `postmark.bulk_emails.list` List bulk requests read
- `postmark.bulk_emails.send` Send bulk emails write

**Inbound rules 3**

- `postmark.inbound_rules.create` Create an inbound rule trigger write
- `postmark.inbound_rules.delete` Delete an inbound rule trigger destructive
- `postmark.inbound_rules.list` List inbound rule triggers read

**Outbound messages 3**

- `postmark.outbound_messages.get` Get outbound message details read
- `postmark.outbound_messages.get_dump` Get outbound message dump read
- `postmark.outbound_messages.search` Search outbound messages read

**Suppressions 3**

- `postmark.suppressions.create` Create suppressions write
- `postmark.suppressions.delete` Delete suppressions destructive
- `postmark.suppressions.list` Get suppressions (dump) read

**Data removals 2**

- `postmark.data_removals.create` Create a data removal request write
- `postmark.data_removals.get` Get a data removal request status read

**Message clicks 2**

- `postmark.message_clicks.list_for_message` Get clicks for a single message read
- `postmark.message_clicks.search` Search message clicks read

**Message opens 2**

- `postmark.message_opens.list_for_message` Get opens for a single message read
- `postmark.message_opens.search` Search message opens read

**Server 2**

- `postmark.server.get` Get the server read
- `postmark.server.update` Edit the server write

**Delivery stats 1**

- `postmark.delivery_stats.get` Get delivery stats read

Questions

## The Postmark MCP server, answered.

**Is there a Postmark MCP server for Claude?**

Yes. actionlake is an MCP gateway: a remote MCP server that gives Claude, or another MCP client, 87 Postmark actions across stats, domains, sender signatures and templates, through the same eight tools it uses for every other connector. actionlake is independent; it is not made or endorsed by Postmark.

**What do I need to connect Postmark?**

Postmark server API token and Postmark account API token (optional). The free call account { op: "connections.requirements", service: "postmark" } lists exactly what to paste.

**Can an AI agent delete or change things in Postmark?**

Only if its key allows it, and only with an explicit confirmation. 9 Postmark actions are destructive, including delete a domain, delete a template and delete suppressions. Each runs only with confirm: true. Under the human confirm policy, or an approval rule on the key, the run waits until a named person approves it.

**Will an AI agent use up my Postmark API limit?**

actionlake paces every call to the limits in the Postmark service file: 300 calls a minute per connection. Repeated reads are answered from cache (44 Postmark actions can be), which never reaches Postmark.

**What does a Postmark action cost?**

One upstream call, the only unit actionlake bills. A list that pages bills one call per page (87 Postmark actions page). Cache hits, searches, dry runs and calls Postmark refused with 401, 403, 429 or a 5xx are free. The Free plan includes 100,000 calls a month with no card. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

**Which Postmark API does it cover?**

The Postmark REST API (api.postmarkapp.com), reference as of 2026-10 at api.postmarkapp.com. It is built from Postmark's documentation as read on 22 October 2026. 87 actions in 19 areas, each one in the signed service file (version 1.0.0).

**Does actionlake keep my Postmark data, and where?**

actionlake processes and stores data in Sydney, Australia; there is no US region yet. Reads may be cached for up to 5 minutes, and a write clears the reads it affects. Each run's request and response is kept, sealed, for your plan's trace window: 1 day on Free, 3 days on Starter, 7 days on Pro, 14 days on Team, 30 days on Business and 30 days on Enterprise. Your Postmark credential is sealed under your tenant's key, never logged and never returned. Your traffic is not used to train models.

**Which AI clients can use it?**

Claude Code, tested by us end to end, and the Claude app as a custom connector, tested by us with an existing key. Other MCP clients that support remote servers over Streamable HTTP (MCP revisions 2025-06-18 and 2025-11-25) and OAuth dynamic client registration, or a bearer header, should connect the same way; we have not tested them. Or plain REST, under the same action names.

## More connectors like Postmark

Shares the most action names with

- [MailerSend 20](https://actionlake.com/connectors/mailersend)
- [Elastic Email 20](https://actionlake.com/connectors/elastic-email)
- [Bird 20](https://actionlake.com/connectors/bird)
- [SparkPost 19](https://actionlake.com/connectors/sparkpost)
- [Mailtrap 16](https://actionlake.com/connectors/mailtrap)
- [Salesforce Marketing Cloud Engagement 14](https://actionlake.com/connectors/salesforce-marketing-cloud-engagement)

Joins with, on shared entities

- [SMTP2GO 2](https://actionlake.com/connectors/smtp2go)
- [Brevo 1](https://actionlake.com/connectors/brevo)
- [EasyDMARC 1](https://actionlake.com/connectors/easydmarc)
- [Red Sift OnDMARC 1](https://actionlake.com/connectors/red-sift-ondmarc)

Browse

- [All Email & messaging connectors](https://actionlake.com/connectors/category/email-and-messaging)
- [All connectors](https://actionlake.com/connectors)
- [How actionlake compares](https://actionlake.com/compare)

actionlake is independent. It is not made or endorsed by Postmark; the name is the vendor's own. Counts are from the Postmark service file, version 1.0.0.

## Give your agent Postmark today.

[Connect Postmark free](https://actionlake.com/console?start=sandbox) [See pricing](https://actionlake.com/pricing)

Start free - 100,000 calls/month, no card. No signup. Hard caps on every key. Cached answers are free.

---

Source: https://actionlake.com/connectors/postmark
More: https://actionlake.com/llms.txt