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ActionPostmarkUpdated September 2026

How do I send transactional email via Postmark?

Short answer: You can postmark send email in Postmark by hand from its own interface, but it won’t repeat itself. On TinyCommand, add the Postmark Postmark Send Email action to a workflow, map its 7 inputs from any upstream app, and it runs automatically every time the trigger fires. No code, and a free tier to start.

Postmark Send Email in Postmark — start free All 3 Postmark actions
Postmark Send Email in Postmark — start free
Inputs

The fields this action accepts.

Every field can be mapped from an upstream trigger, AI step, table row, or hard-coded literal.

FieldTypeRequiredDescription
From
From
stringRequiredSender email (must be a verified sender signature in Postmark)
To
To
stringRequiredRecipient email address (comma-separated for multiple)
Subject
Subject
stringRequirede.g. "e.g. Your order has shipped"
HTML Body
HtmlBody
stringRequiredHTML content of the email
Plain Text Body
TextBody
stringOptionalPlain text fallback for email clients that don't render HTML
Tag
Tag
stringOptionalTag for categorizing this email in Postmark analytics
Reply-To
ReplyTo
stringOptionalReply-to email address
Sample request
{
  "From": "sender@yourcompany.com",
  "To": "recipient@example.com",
  "Subject": "e.g. Your order has shipped",
  "HtmlBody": "{{trigger.HtmlBody}}",
  "TextBody": "{{trigger.TextBody}}"
}
Returns
{
  "To": "recipient@example.com",
  "Message": "OK",
  "ErrorCode": 0,
  "MessageID": "b7bc2f4a-e38e-4336-af7d-e6c392c2f817",
  "SubmittedAt": "2025-01-15T12:00:00.0000000Z"
}

Use these fields in downstream nodes for routing, logging, or error handling.

Triggered by

Apps that pair well as the trigger for Postmark Send Email.

Any of these apps can fire this action as part of a workflow.

Gmail → Postmark
1 Gmail triggers
Slack → Postmark
13 Slack triggers
Google Sheets → Postmark
2 Google Sheets triggers
HubSpot → Postmark
18 HubSpot triggers
FAQ

Questions about Postmark Send Email.

What does the Postmark Send Email action do in Postmark?
Sends a transactional email with HTML/text body and attachments. Postmark is purpose-built for transactional (separate marketing streams) and has industry-leading deliverability.
What inputs does Postmark Send Email require?
Required: From, To, Subject, HTML Body. Every input accepts a static value or a variable from any upstream node in your workflow.
Can I use dynamic inputs from earlier workflow nodes?
Yes. Any field on this action can pull values from upstream nodes, whether that's a form response, a trigger payload, an AI output, or a lookup result.
What happens if Postmark returns an error?
The run history shows the failed step with its input and the error message Postmark returned, so you can fix the input and run the workflow again. Automatic retries are built into HTTP steps only, where you can also set your own retry count and delay.
Does Postmark Send Email support batch operations?
Run Postmark Send Email inside a loop to process each item in an array. TinyCommand does not throttle calls for you, so for large arrays add a Delay step if you need to stay within Postmark's rate limits.
More actions

Other Postmark actions.

Action
Postmark Get Delivery Stats
Returns deliverability metrics — sent, delivered, bounced, opened, clicked, complained — over a date range. For "is our deliverability healthy?" monitoring workflows.
Action
Postmark Send Template Email
Fires a pre-built template with merge model. For production transactional patterns where templates are reviewed in Postmark UI and reused.
Postmark Send Email in Postmark — start free