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Vendor — 01 active of 1 cataloged

# Postmark

[postmarkapp.com ↗](https://postmarkapp.com/)/`vndr://postmark`/verified 2026-09-25

Postmark ships one cataloged agent — agent services — over api interface with cloud hosting.

RUBRIC

## Portfolio spec sheet

| Agent | Category | Interfaces | Hosting | Pricing | Status | Caps |
| --- | --- | --- | --- | --- | --- | --- |
| PostmarkPostmark supplies transactional email delivery and inbound webhooks that turn incoming messages into structured JSON for an application. | agent service | api | cloud | Free developer tier: 100 emails/month; Pro with inbound processing: $16.50/month at 10,000 emails (checked October 12, 2026) | active | 2 tags |

Capability tags — the atomic taxonomy. Open an agent for the full list.

NOTES

## Field notes

[Postmark](https://www.agentlist.io/systems/postmark)

A service that already sends transactional email and wants an agent to classify incoming replies or draft a response.

Caveat — Inbound processing is listed on Pro and Platform plans; confirm the receiving allowance for your plan. Your application still owns conversation state, approvals, and agent behavior. Documentation reviewed October 12, 2026; no hands-on delivery benchmark.

CAP

## Capability coverage

-   [API-native](https://www.agentlist.io/capabilities/api-native)
-   [Messaging surface](https://www.agentlist.io/capabilities/messaging-infra)

WIRE

## Transports (2)

-   [Email (SMTP/IMAP)](https://www.agentlist.io/transports/email)
-   [Webhooks](https://www.agentlist.io/transports/webhooks)

PEER

## Vendors in the same categories

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-   [AgentCard1 agent](https://www.agentlist.io/ai/agentcard)
-   [AgentMail1 agent](https://www.agentlist.io/ai/agentmail)
-   [Arcade1 agent](https://www.agentlist.io/ai/arcade)
-   [Coinbase1 agent](https://www.agentlist.io/ai/coinbase)
-   [Composio1 agent](https://www.agentlist.io/ai/composio)
-   [Daytona1 agent](https://www.agentlist.io/ai/daytona)

Vendor pages are generated from the catalog seed. Coverage reflects systems cataloged as of 2026-09-25; it is not a claim about a company's full product line.

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Source: [Postmark AI — 1 agent cataloged | agentlist.io](https://www.agentlist.io/ai/postmark). This is the public page rendered as Markdown; interactive controls require the website.