# Postmark

> The best deliverability reputation, but no marketing platform, no idempotency and unsigned webhooks. I picked Resend.

- Verdict: Skip
- Vendor: ActiveCampaign
- Layer: [Email](https://cloudlesslabs.com/stack/layers/email.md)
- Last reviewed: 18 October 2026, by Nicolas Dao (Cloudless Labs, Sydney)
- Web page: https://cloudlesslabs.com/stack/postmark/. The whole stack in one file: https://cloudlesslabs.com/stack/brief.md

A good product I've chosen not to use.

## Pricing

$15 a month for 10k emails, $115 for 100k, $775 for 1M.

## Gotchas, with fixes

- **Gotcha:** The unscoped npm package postmark-mcp was malware that BCC'd every email to an attacker.
  **Fix:** If you use Postmark with agents, the official package is @activecampaign/postmark-mcp.

## Provisioning

Pulumi via a Terraform provider · Community Terraform provider

Community provider, last released 2023.

## Use instead

Resend: transactional and marketing on one platform, with idempotency keys and signed webhooks.

## Alternatives

- [Resend](https://cloudlesslabs.com/stack/resend/index.md): Always, for me.

## Where it fits

- [Sending email](https://cloudlesslabs.com/stack/use-cases/email.md): don't. The best deliverability reputation, but no marketing platform, so you'd run two email vendors. Resend does transactional and marketing in one, with idempotency keys and signed webhooks. Instead: [Resend](https://cloudlesslabs.com/stack/resend/index.md).

## Related

- [Email](https://cloudlesslabs.com/stack/layers/email.md): every tool in this layer, with its verdict
- [The whole stack in one file](https://cloudlesslabs.com/stack/brief.md): every use case and tool, for questions that span many
- [Map of every Markdown file on cloudlesslabs.com, with what each one answers](https://ask.cloudlesslabs.com)