Postmark

Send transactional emails, manage templates, track bounces, and configure webhooks with the Postmark API.

Detail	Value
Category	Communication
Base URL	https://api.postmarkapp.com
Authentication	API Key
Endpoints	8
Connector key	email

Using Postmark in a workflow

1. Go to Connections and click New Connection.
2. Pick Postmark from the marketplace.
3. Enter your credentials (see Authentication above for what's expected).
4. In a workflow, drop an API Call node and select this connection.
5. Pick the operation you need from the Operation dropdown — the full list is below.

Available endpoints

Endpoint	Summary
POST /email	Send a single email
POST /email/batch	Send a batch of up to 500 emails
POST /email/withTemplate	Send an email using a saved template
GET /bounces	Retrieve bounce records
GET /templates	List all email templates
POST /templates	Create a new email template
GET /messages/outbound	Search sent outbound messages
GET /stats/outbound	Get outbound delivery statistics

Each endpoint is documented in full below. Use the outline on the right to jump to one.

POST /email

Send a single email

Detail	Value
Operation ID	email.send
Method	POST
Path	/email

Parameters

No parameters.

Request Body

Field	Type
From	string
To	string
Subject	string
HtmlBody	string
TextBody	string

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.send.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

Required fields are marked — fill them or the call will fail at runtime.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.

POST /email/batch

Send a batch of up to 500 emails

Detail	Value
Operation ID	email.sendBatch
Method	POST
Path	/email/batch

Parameters

No parameters.

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.sendBatch.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.

POST /email/withTemplate

Send an email using a saved template

Detail	Value
Operation ID	email.sendWithTemplate
Method	POST
Path	/email/withTemplate

Parameters

No parameters.

Request Body

Field	Type
TemplateId	integer
TemplateModel	object
From	string
To	string

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.sendWithTemplate.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

Required fields are marked — fill them or the call will fail at runtime.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.

GET /bounces

Retrieve bounce records

Detail	Value
Operation ID	email.listBounces
Method	GET
Path	/bounces

Parameters

Name	Location	Type	Required
count	query	integer	No
type	query	string	No

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.listBounces.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.

GET /templates

List all email templates

Detail	Value
Operation ID	email.listTemplates
Method	GET
Path	/templates

Parameters

No parameters.

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.listTemplates.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.

POST /templates

Create a new email template

Detail	Value
Operation ID	email.createTemplate
Method	POST
Path	/templates

Parameters

No parameters.

Request Body

Field	Type
Name	string
Subject	string
HtmlBody	string

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.createTemplate.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

Required fields are marked — fill them or the call will fail at runtime.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.

GET /messages/outbound

Search sent outbound messages

Detail	Value
Operation ID	email.searchOutbound
Method	GET
Path	/messages/outbound

Parameters

Name	Location	Type	Required
count	query	integer	No
recipient	query	string	No

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.searchOutbound.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.

GET /stats/outbound

Get outbound delivery statistics

Detail	Value
Operation ID	email.getStats
Method	GET
Path	/stats/outbound

Parameters

No parameters.

Using this endpoint in a workflow

1. Add an API Call node to your workflow.
2. Pick your Postmark connection from the Connection dropdown.
3. In the Operation dropdown, select email.getStats.
4. Fill in the parameter fields that appear. Use {{...}} to reference upstream values.

What it returns

The API Call node writes the response to the workflow context:

{
  status: 200,
  success: true,
  data: { ...response body from the API... },
  latencyMs: 142
}

Reference response fields downstream as {{nodeId.data.path}}. The exact response shape is documented on the upstream Postmark API reference.