---
title: "Templates"
description: "Author reusable email content for campaigns and the API."
url: https://www.unitpost.com/guides/templates
section: Guides
updated: 2026-07-31
---
# Templates

## Templates

> Author reusable email content for campaigns and the API.

Templates are reusable email designs — a subject and a body built from the component library (or raw HTML). A template can be used by a campaign, or referenced by API sends via its id, so you author content once and send it many ways.

Templates carry a category. Marketing templates are the ones campaigns use. Transactional templates are for API-triggered, one-to-one mail (receipts, resets) and are intentionally NOT selectable for campaigns.

> **Transactional templates can't be campaigned:** Creating a campaign from a transactional template is blocked by the server (not just the form), because campaign mail to a marketing audience must honor unsubscribe and consent rules that transactional mail doesn't. Use — or clone into — a marketing template instead.

Images and other assets a template references live in the Library; a template that's still a draft, or that references missing assets, can't back a campaign send.

## Related

- [Library](https://www.unitpost.com/guides/library): Store and manage images and assets your templates reference.
- [Contacts](https://www.unitpost.com/guides/contacts): The people you can email — subscription state, custom fields, and imports.
- [Suppressions](https://www.unitpost.com/guides/suppressions): Addresses blocked from receiving mail — protecting your sending reputation.