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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 freeSee 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
  • 87actionsin one signed file
  • 45readlook, never change
  • 33writecreate and update
  • 9wait for a yesdestructive, 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_tokenPostmark server API token
    • account_tokenPostmark 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 callcheck { 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_tokenaccount_token
Limits we pace to
300 calls a minute, per connection
API covered
Postmark REST API (api.postmarkapp.com), reference as of 2026-10api.postmarkapp.com
Built from
Postmark's documentation, read 22 October 2026postmarkapp.compostmarkapp.compostmarkapp.com
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.

  • 45readlook, never change
  • 33writecreate and update
  • 9destructivewait 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.

ActionWhat it doesEffectSame name in
postmark.domains.listList domainsList domains.readcomm.sending_domain.list18 connectors
postmark.outbound_messages.searchSearch outbound messagesSearch outbound messages.readcomm.delivery_event.search4 connectors
postmark.bounces.listList bouncesList bounces.readcomm.delivery_event.list16 connectors
postmark.domains.createCreate a domainCreate a domain.writecomm.sending_domain.create15 connectors
postmark.templates.listList templatesList templates.readcomm.email_template.list40 connectors
postmark.domains.deleteDelete a domainDelete a domain.destructivecomm.sending_domain.delete14 connectors
postmark.templates.createCreate a templateCreate a template.writecomm.email_template.create34 connectors
postmark.email.sendSend a single emailSend a single email.writecomm.email.send32 connectors
postmark.suppressions.listGet suppressions (dump)Get suppressions (dump).readcomm.suppression.list17 connectors
postmark.suppressions.createCreate suppressionsCreate suppressions.writecomm.suppression.create14 connectors
postmark.webhooks.createCreate a webhookCreate a webhook.writeautomation.webhook.create209 connectors
postmark.webhooks.listList webhooksList webhooks.readautomation.webhook.list202 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. Readread

    List domains in Postmark and tell me what stands out.

    callspostmark.domains.list

  2. Writewrite

    Create a domain in Postmark. Show me exactly what you will send before you save it.

    callspostmark.domains.create

Governance for Postmark

Destructive actions wait for a yes.

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

  • Delete a domainpostmark.domains.delete
  • Delete a templatepostmark.templates.delete
  • Delete suppressionspostmark.suppressions.delete
  • Delete a webhookpostmark.webhooks.delete
  • Delete a serverpostmark.servers.delete
  • Rotate a domain's DKIM keypostmark.domains.rotate_dkim
  • Delete an inbound rule triggerpostmark.inbound_rules.delete
  • Archive a message streampostmark.message_streams.archive
  • Delete a sender signaturepostmark.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.

dopostmark.domains.deleteconfirm_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: "[email protected]" },    { match: "postmark.templates.delete", approver: "[email protected]" },    { match: "postmark.suppressions.delete", approver: "[email protected]" }  ]}
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.

  • 1upstream call per actionall 87 Postmark actions
  • 87actions pageeach page of a long list is one call
  • 44reads can be cacheda cache hit costs nothing
  • 100,000calls a month, freepaid plans from US$49 a month for 250,000

See pricing

Action index

Every Postmark action.

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

Stats12
  • postmark.stats.bounce_countsGet bounce countsread
  • postmark.stats.click_browser_familiesGet browser usageread
  • postmark.stats.click_countsGet click countsread
  • postmark.stats.click_locationsGet click locationread
  • postmark.stats.click_platformsGet browser platform usageread
  • postmark.stats.open_countsGet email open countsread
  • postmark.stats.open_email_clientsGet email client usageread
  • postmark.stats.open_platformsGet email platform usageread
  • postmark.stats.outbound_overviewGet outbound overview statisticsread
  • postmark.stats.sent_countsGet sent countsread
  • postmark.stats.spam_complaintsGet spam complaint countsread
  • postmark.stats.tracked_email_countsGet tracked email countsread
Domains9
  • postmark.domains.createCreate a domainwrite
  • postmark.domains.deleteDelete a domaindestructive
  • postmark.domains.getGet a domainread
  • postmark.domains.listList domainsread
  • postmark.domains.rotate_dkimRotate a domain's DKIM keydestructive
  • postmark.domains.updateEdit a domainwrite
  • postmark.domains.verify_dkimVerify a domain's DKIMwrite
  • postmark.domains.verify_return_pathVerify a domain's Return-Pathwrite
  • postmark.domains.verify_spfVerify a domain's SPF record (deprecated)write
Sender signatures8
  • postmark.sender_signatures.createCreate a sender signaturewrite
  • postmark.sender_signatures.deleteDelete a sender signaturedestructive
  • postmark.sender_signatures.getGet a sender signatureread
  • postmark.sender_signatures.listList sender signaturesread
  • postmark.sender_signatures.request_new_dkimRequest a new DKIM key for a sender signature (deprecated)write
  • postmark.sender_signatures.resend_confirmationResend a sender signature confirmationwrite
  • postmark.sender_signatures.updateEdit a sender signaturewrite
  • postmark.sender_signatures.verify_spfVerify a sender signature's SPF record (deprecated)write
Templates7
  • postmark.templates.createCreate a templatewrite
  • postmark.templates.deleteDelete a templatedestructive
  • postmark.templates.getGet a templateread
  • postmark.templates.listList templatesread
  • postmark.templates.pushPush templates to another serverwrite
  • postmark.templates.updateEdit a templatewrite
  • postmark.templates.validateValidate a templateread
Webhooks7
  • postmark.webhooks.createCreate a webhookwrite
  • postmark.webhooks.deleteDelete a webhookdestructive
  • postmark.webhooks.getGet a webhookread
  • postmark.webhooks.get_statisticsGet webhook statisticsread
  • postmark.webhooks.listList webhooksread
  • postmark.webhooks.updateEdit a webhookwrite
  • postmark.webhooks.verifyVerify a webhookwrite
Message streams6
  • postmark.message_streams.archiveArchive a message streamdestructive
  • postmark.message_streams.createCreate a message streamwrite
  • postmark.message_streams.getGet a message streamread
  • postmark.message_streams.listList message streamsread
  • postmark.message_streams.unarchiveUnarchive a message streamwrite
  • postmark.message_streams.updateEdit a message streamwrite
Servers5
  • postmark.servers.createCreate a serverwrite
  • postmark.servers.deleteDelete a serverdestructive
  • postmark.servers.getGet a serverread
  • postmark.servers.listList serversread
  • postmark.servers.updateEdit a serverwrite
Bounces4
  • postmark.bounces.activateActivate a bouncewrite
  • postmark.bounces.getGet a single bounceread
  • postmark.bounces.get_dumpGet bounce dumpread
  • postmark.bounces.listList bouncesread
Email4
  • postmark.email.sendSend a single emailwrite
  • postmark.email.send_batchSend a batch of emailswrite
  • postmark.email.send_batch_with_templatesSend a batch of emails with templateswrite
  • postmark.email.send_with_templateSend an email with a templatewrite
Inbound messages4
  • postmark.inbound_messages.bypassBypass rules for a blocked inbound messagewrite
  • postmark.inbound_messages.getGet inbound message detailsread
  • postmark.inbound_messages.retryRetry a failed inbound messagewrite
  • postmark.inbound_messages.searchSearch inbound messagesread
Bulk emails3
  • postmark.bulk_emails.getGet bulk request statusread
  • postmark.bulk_emails.listList bulk requestsread
  • postmark.bulk_emails.sendSend bulk emailswrite
Inbound rules3
  • postmark.inbound_rules.createCreate an inbound rule triggerwrite
  • postmark.inbound_rules.deleteDelete an inbound rule triggerdestructive
  • postmark.inbound_rules.listList inbound rule triggersread
Outbound messages3
  • postmark.outbound_messages.getGet outbound message detailsread
  • postmark.outbound_messages.get_dumpGet outbound message dumpread
  • postmark.outbound_messages.searchSearch outbound messagesread
Suppressions3
  • postmark.suppressions.createCreate suppressionswrite
  • postmark.suppressions.deleteDelete suppressionsdestructive
  • postmark.suppressions.listGet suppressions (dump)read
Data removals2
  • postmark.data_removals.createCreate a data removal requestwrite
  • postmark.data_removals.getGet a data removal request statusread
Message clicks2
  • postmark.message_clicks.list_for_messageGet clicks for a single messageread
  • postmark.message_clicks.searchSearch message clicksread
Message opens2
  • postmark.message_opens.list_for_messageGet opens for a single messageread
  • postmark.message_opens.searchSearch message opensread
Server2
  • postmark.server.getGet the serverread
  • postmark.server.updateEdit the serverwrite
Delivery stats1
  • postmark.delivery_stats.getGet delivery statsread

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

Joins with, on shared entities

Browse

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 freeSee pricing

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