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Implemented
Messaging, collaboration & support
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Postmark

Send transactional email and templated email with Postmark, manage templates, and read message streams, outbound activity, opens, clicks, bounces, suppressions and stats.

Trigger receipts, notifications and account email from business events and feed delivery, bounce and engagement data back into CRM and support tools.

Build a flow with PostmarkProvider API documentation

Source actions

13

Destination actions

4

Data types

11

Validation status

Implemented · fixture tested.

Implementation is checked against provider-shaped fixtures for every action, authentication failures, rate limits, pagination and duplicate safety. Provider sandbox and authorised account validation are recorded separately when credential-backed runs are completed.

What you can map

bounces
  • Get bounce
    Source

    One bounce with its type, details and reactivation status.

  • List bounces
    Source

    Bounces and spam complaints filtered by type, address, tag, stream or date.

clicks
  • List message clicks
    Source

    Link click events for outbound messages, filtered by recipient, tag or stream.

email
  • Send email
    Destination
    Not retried automatically

    Sends one transactional email (up to 50 recipients) through a transactional message stream.

message streams
  • Get message stream
    Source

    One message stream with its unsubscribe handling.

  • List message streams
    Source

    Transactional, broadcast and inbound message streams on the server.

opens
  • List message opens
    Source

    Open events for outbound messages, filtered by recipient, tag or stream.

outbound messages
  • Get outbound message details
    Source

    One sent message with bodies and its delivery, open, click and bounce events.

  • Search outbound messages
    Source

    Sent messages filtered by recipient, sender, tag, status, stream or date, newest first.

outbound stats
  • Get outbound statistics
    Source

    Sent, bounced, spam complaint, open and click totals for a period, tag or stream.

server
  • Get server
    Source

    The server this token belongs to, with its tracking and delivery settings.

suppressions
  • List suppressions
    Source

    Addresses suppressed on one message stream because of hard bounces, spam complaints or unsubscribes.

template email
  • Send email with template
    Destination
    Not retried automatically

    Sends one transactional email rendered from a Postmark template and a template model.

templates
  • Create template
    Destination
    Not retried automatically

    Creates a standard template or layout.

  • Get template
    Source

    One template with its subject and bodies.

  • List templates
    Source

    Templates and layouts on the server.

  • Update template
    Destination
    Duplicate protected

    Updates a template's name, alias, subject, bodies or layout.

Authentication

Server API token

Plans and access

All Postmark plans, including the free developer tier (100 emails per month). Sending needs a confirmed sender signature or verified domain. Server API tokens are scoped to one Postmark server. Account-level endpoints (domains, sender signatures, servers) need an account token and are not included.

Test environment

Create a server in Sandbox mode, or use the POSTMARK_API_TEST token, to accept messages without delivering them.

Rate limits

Postmark does not publish a fixed request rate; it returns HTTP 429 when a server sends too quickly. Messages are limited to 50 recipients and 10 MB.

Provider events

Per-stream webhooks for delivery, bounce, spam complaint, open, click and subscription change events. Nexra event triggers are not yet available; flows run on demand or on a schedule.

Before you build a flow

  • Only transactional (outbound) message streams can be used to send; broadcast streams are refused to avoid audience-wide sends.
  • Batch send endpoints, bounce reactivation, suppression changes and all deletes are not implemented.
  • Postmark has no idempotency key for sends; uncertain sends are not repeated automatically.
  • Message search is limited by Postmark to the most recent 10,000 results (offset + count) and the server's retention window (45 days by default).
  • Suppressions are read per message stream and are not paginated by Postmark.
  • Postmark answers most validation failures with HTTP 422 and an ErrorCode; Nexra reports them as validation errors.