Postmark

Send and receive emails through Postmark using a mail channel.

Configuration

Field	Description
Server Token	Your Postmark Server API Token. Found in your Postmark server's API Tokens tab.
From Email	The default sender email address. Must be a verified sender signature in Postmark.
Webhook Secret	Optional. Shared secret used to authenticate inbound webhooks. See Receiving emails below.

Usage

Receiving emails

Configure a Postmark inbound webhook to point to your integration's webhook URL. Incoming emails will create conversations and messages automatically.

Conversations are keyed by the email thread, inferred from the References and In-Reply-To headers. The first email in a thread creates a new conversation; replies that share a thread root Message-ID are added to the same conversation. Subject is kept on each message's subject tag.

If you set a Webhook Secret in the integration configuration, append it to your webhook URL as a query parameter: https://your-webhook-url?secret=YOUR_SECRET. Requests without a matching secret will be rejected.

Sending emails

The integration sends emails as replies to inbound conversations: messages sent to a conversation created from an inbound email are delivered to the original sender with the correct In-Reply-To and References headers to preserve threading. Bot-initiated conversations (not tied to an inbound email) are not supported.

Use the mail channel to send messages. All standard message types are supported:

Text — sent as the email body
Image, Audio, Video, File — sent as email attachments
Location — sent as a Google Maps link
Card — title, subtitle, action links, and optional image attachment
Carousel — multiple cards separated by horizontal rules
Choice / Dropdown — rendered as a numbered list
Bloc — mixed content (text, media, locations) in a single email

All message types support optional cc, bcc, and subject fields.

Limitations

The integration does not track delivery events (bounces, opens, clicks).

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